what is the biggest number?
479834
There is no largest number, as one can simply define a new number to be strictly larger than it. There is a largest named number, http://www.math.toronto.edu/mathnet/questionCorner/largestnumber.html , and largest used number http://www-users.cs.york.ac.uk/susan/cyc/g/graham.htm .
771506
It could be any number between 0000 and 9999. If you need a list, start by writing down 0001, then 0002, then 0003, until you get to 9999. There's your list.
951824
The World Champion largest number, listed in the last Guinness Book of Records is an upper bound, derived by R. L. Graham, from a problem in a part of combinatorics called Ramsey theory.\nGraham's number cannot be expressed using the conventional notation of powers, and powers of powers. If all the material in the universe were turned into pen and ink it would not be enough to write the number down. Consequently, this special notation, devised by Donald Knuth is necessary.\n\nClick on link to see it
1023056
There is no largest prime, since there are an infinite number of prime numbers, but there is a largest *known* prime number.  It's a Mersenne prime (of the form 2^p-1) where p is another prime.  Specifically it is 2 ^ 30,402,457 - 1.  The number is too big to represent here because it is 9,152,052 digits long.\n\nThis number and most of the recent Mersenne primes were calculated using a collective effort known as the 'Greater Internet Mersenne Prime Search' (or GIMPS) for short.  Several tens of thousands of volunteers around the world are using background processing time on their PCs to check these high-digit Mersenne primes.\n\nThe number 30,402,457 was tested as the exponent in 2^p-1 and the result was found to be prime as part of this GIMPS project.  The credit goes to both the project (all contributors to the GIMPS project) and to the people who were running that specific test.  In this case it was Dr. Curtis Cooper and Dr. Steven Boone, professors at Central Missouri State University who discovered it December 15, 2005.  The official credit for this new discovery is listed as "Cooper, Boone, Woltman, Kurowski, et. al.".  By the way, I'm one of the et. al. having racked up several years of computational time running tests.\n\nThe search continues and there is a prize for the person that finds the next prime number of over 10 million digits... join now if you want to share part of the $100,000 pot.\n\nIf you want to know the English name of the current largest known prime, it starts, "three hundred fifteen tremillia millia quin quagin millia sescendo octo gintillion, four hundred sixteen tremillia millia quin quagin millia sescenun octo gintillion..." (See the last link for the full name.)
385212
If you're having to ask this question the number must be freakin huge! Revise your question and tell us. Come on, what is it? Like a hundred?
10816
4,850,180,331,125,622,098 according to the calculator on Windows. \n\nThis calculator seems to be only 14 characters long, so verification can be done as follows.\nFind the hex eqv for the longest possible number there starting from the beginning. This has already been done in the earlier answer. Next, in the decimal eqv, multiply by 16^2, add 5*16^1 and 2*16^0. That should give you the answer.
214455
The largest number that has a commonly-known specific name is a "googleplex", which is a 1 followed by a googol zeros, where a "googol" is  (a 1 followed by 100 zeros). \n\nHowever, there would be nothing stopping you from giving a special name to a still larger number (such as a googleplex plus 1), and then that would become the largest named number once the term became commonly known. \n\nIn summary, then: the mathematical question "what is the highest possible number" has no answer, because there is no such thing. But the sociological question "what is the largest number that anyone has ever decided to give a specific name to, a name which has become commonly known" is, for now, a "googleplex" (until someone decides to coin a phrase for a still larger number and it catches on and becomes commonly known).
805790
number is 0000500005000050000500005000050000500005000080000800058580515215641052342697543216757924432176467402637597241342194654301465276021734217645430146526740734257962443021756457624432160267579576052594984523225855
535905
0 ( Zero )\n\nThe most importanat number which enables us to progress.
1114299
http://www.newscientist.com/article.ns?id=dn4438\n\nhttp://www.math.utah.edu/~alfeld/math/largeprime.html\n\nI just did a search on yahoo\n"largest prime number"\nKeep it in quotes.  You'll find a lot of info.\n\nThere are more recent sites like this one.\nhttp://en.wikipedia.org/wiki/Prime_number#Location_of_the_largest_known_prime
731146
In theory there is no maximum number.  In practice 10 to the 100 power is about as large as you ever need.
103035
yes, numbers are infinate
440377
There is no highest number or a smallest/lowest number. whatever number you can think off, just add 1 and you get the next bigger number. Similarly subtract 1 to get the next smallest number.\nThe numbers are infinte.\nThe biggest named number is googolplex. That is 1 followed by one googol zeroes (a googol - is 1 followed by 100 zeroes = 10^100) \nGoogolplex = (10)^(10^100)
802735
You only have about 145 three-digit numbers to test.  The even numbers from 448 to 546 have even squares beginning with 2, from 634 to 706 have even squares beginning with 4, from 776 to 836 have even squares beginning with 6, and from 896 to 948 have even squares beginning with 8.\n\nThe smallest one is 478^2 = 228484, and the largest is 932^2 = 868624.  I would expect there to be 6 or 7 others.
1003770
define largest, by weight, lenght
278613
The highest number is infinity.
967619
The World Champion largest number, listed in the last Guinness Book of Records is an upper bound, derived by R. L. Graham, from a problem in a part of combinatorics called Ramsey theory.\nGraham's number cannot be expressed using the conventional notation of powers, and powers of powers. If all the material in the universe were turned into pen and ink it would not be enough to write the number down. Consequently, this special notation, devised by Donald Knuth is necessary.\n3^3 means '3 cubed', as it often does in computer printouts.\n\n3^^3 means 3^(3^3), or 3^27, which is already quite large: 3^27 = 7,625,597,484,987, but is still easily written, especially as a tower of 3 numbers.\n\n3^^^3 = 3^^(3^^3), however, is 3^^7,625,597,484,987 = 3^(7,625,597,484,987^7,625,597... which makes a tower of exponents 7,625,597,484,987 layers high.\n\n3^^^^3 = 3^^^(3^^^3), of course. Even the tower of exponents is now unimaginably large in our usual notation, but Graham's number only starts here.\n\nConsider the number 3^^^...^^^3 in which there are 3^^^^3 arrows. A largish number!\n\nNext construct the number 3^^^...^^^3 where the number of arrows is the previous 3^^^...^^^3 number.\n\nAn incredible, ungraspable number! Yet we are only two steps away from the original ginormous 3^^^^3. Now continue this process, making the number of arrows in 3^^^...^^^3 equal to the number at the previous step, until you are 63 steps, yes, sixty-three, steps from 3^^^^3. That is Graham's number.\nThe link explains verious theories of large numbers.