In the American-based system, 1,000,000,000,000,000 would equal one quadrillion. In the Traditional British system, this would be equal to one thousand billion.
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That number quintillion.
15 zeros, in America, is Quadrillion. In other countries is one thousand billion.
Septillion
1,000,000,000,000 is 1 trillion a 1 followed by 12 zeros a 1 followed by 15 zeros is 1 quardrillion