Oh, dude, that's a big number! Like, that's like... a lot of 9s. Technically, if you add all those 9s up, you'd get like... a really huge number. But, like, who's got time for that, am I right?
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A googol is a 1 with a hundred zeroes behind it. We can write a googol using exponents by saying a googol is 10^100. The biggest named number that we know is googolplex, ten to the googol power, or (10)^(10^100). That's written as a one followed by googol zeroes.
So it's basically 999 googol
10000000000000000000000000000000
9999999999999 x 99999999999999999999999999999999999999999 = 999999999999899999999999999999999999999990000000000001 [That was actually much quicker to work out than to type in (accurately)!]
The question cannot be answered because there is no arithmetic operator between the first string of nines and the second.
nine hundred ninety-nine septillion,nine hundred ninety-nine sextillion,nine hundred ninety-nine quintillion,nine hundred ninety-nine quadrillion,nine hundred ninety-nine trillion,nine hundred ninety-nine billion,nine hundred ninety-nine million,nine hundred ninety-nine thousand,nine hundred ninety-nine