It's 9*9*9*9*9*9*9*9*9 or 387,420,489
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9 to the negative 9th power is 2.58117479e-9
5.3965953e-16
10 to the power of 9 equals 1,000 million.
9 to the power of 3 (9^3) = 729
Negative 9 to the negative 2nd power (-9-2) = 0.012345679 (repeating).