Answer:
The last answer was only half right. A googol is a 1 followed by 100 zeros. A googolplex is 10^googol. It is said that writing this number in long format, 10 pt font, would stretch across the galaxy.
I tried writing a CPP program that would write it out, but I gave up after my laptop battery died. I'm pretty sure a long integer stops are 2*10^9, therefore it wouldn't be possible in any programming language that I know of.
longest number most programming languages support = 2*10^9
googolplex = 1*10^100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000