1,000,000,000 = 9 zeros (if you re in the US)
The rest are here:
btw The term googolplexian = googolplexplex.
Probable the largest conceivable number is somewhere beyond googol and below googolplex (You can t really truly grasp the size of googolplex. You could not jam googlolplex Plank cubes, that is, the smallest possible size measurement, into the observable universe. Its way too large of a number to use in anything other than just seeing how large you can get. Nothing you can think of will ever be this large, no matter how hard you try)