$${ 10 }^{ -7 } \times 16$$
$\frac{1}{625000}=0.0000016$
$$\frac{1}{10000000}\times 16$$
$$\frac{1}{625000}$$
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$\frac{1}{2 ^ {3} \cdot 5 ^ {7}} = 1.6 \times 10^{-6}$