There are 15 zeros in a quadrillion.
A quadrillion is represented numerically as 1,000,000,000,000,000 or 10^15. Since each place value represents powers of ten, and a quadrillion is 10^15, it must contain 15 zeros.
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How Many Zeros Are in All Numbers, Million, Billion, Trillion, Quadrillion, Sextillion to Googolplex
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