$$\frac{ 7 }{ 160 \times 777777777 }$$
$\frac{1}{17777777760}\approx 5.625000006 \cdot 10^{-11}$
$$\frac{7}{124444444320}$$
$$\frac{1}{17777777760}$$
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$\frac{1}{2 ^ {5} \cdot 3 ^ {2} \cdot 5 \cdot 37 \cdot 333667} = 5.625000005625 \times 10^{-11}$