$$1.6 \times { 10 }^{ -19 }$$
$0.00000000000000000016$
$$1.6\times \frac{1}{10000000000000000000}$$
$$\frac{1}{6250000000000000000}$$
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$\frac{1}{2 ^ {16} \cdot 5 ^ {20}} = 1.5999999999999999 \times 10^{-19}$