Largest number in ten bytes of code Your goal is to print (to the standard output) the largest number possible, using just ten characters of code.


You may use any features of your language, except built-in exponentiation functions.

Similarly, you may not use scientific notation to enter a number. (Thus, no 9e+99.)

The program must print the number without any input from the user. Similarly, no reading from other files, or from the Web, and so on.
Your program must calculate a single number and print it. You can not print a string, nor can you print the same digit thousands of times.
You may exclude from the 10-character limit any code necessary to print anything. For example, in Python 2 which uses the print x syntax, you can use up to 16 characters for your program.
The program must actually succeed in the output. If it takes longer than an hour to run on the fastest computer in the world, it's invalid.
The output may be in any format (so you can print 999, 5e+100, etc.)
Infinity is an abstract concept, not a number. So it's not a valid output.
Perl, >1.96835797883262e+18

time*time


Might not be the largest answer... today! But wait enough millennia and it will be!

Edit:

To address some of the comments, by "enough millenia," I do in fact mean n100s of years.

To be fair, if the big freeze/heat death of the universe is how the universe will end (estimated to occur ~10100 years), the "final" value would be ~10214, which is certainly much less than some of the other responses (though, "random quantum fluctuations or quantum tunneling can produce another Big Bang in 101056 years"). If we take a more optimistic approach (e.g. a cyclic or multiverse model), then time will go on infinitely, and so some day in some universe, on some high-bit architecture, the answer would exceed some of the others.

On the other hand, as pointed out, time is indeed limited by the size of integer/long, so in reality something like ~0 would always produce a larger number than time (i.e. the max time supported by the architecture).

This wasn't the most serious answer, but I hope you guys enjoyed it!