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What's a Googolplex?
A googolplex is a very very big number, as distinct from just a very big number. It is:
TEN raised to the power of a GOOGOL
Or, to put it another way, it's 10GOOGOL
10^6 is 1000000, (6 zeroes), 10^9 is 1000000000, (nine zeroes), and 10^googol is a number which has 1 followed by a googol zeroes. So, how many is a googol. That's very big too... find out here
Also see very big numbers encountered in the page about operators