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It depends on your country. In America, 10^15 is referred to as a quadrillion
"Second power" means that you multiply something with itself. In this case, (10 + 15) (10 + 15).
10^15 = 1,000,000,000,000,000 (one quadrillion).
10 to the power of 15 when multiplying items with the same base (in this case 10) you simply add the powers
10 to the power of 15
The answer to 1.5 times 10 to the power of 16 is 15,000,000,000,000,000 (15 quadrillion).