18.
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Perhaps you mean "quintillion," since "quintrillion" is not actually a number. There are eighteen zeros in one quintillion--i.e., 1,000,000,000,000,000,000.
1 quintillion is equal to 1 followed by 18 zeros. When you multiply 1 quintillion by 1 quintillion, you are essentially multiplying 1 with 18 zeros by 1 with another 18 zeros. This results in a number with 36 zeros, which is equal to 1 followed by 36 zeros. This number is known as a sextillion.
A quintillion.
That number quintillion.
1,000,000,000,000,000,000 = 1018 = Quintillion