$$16^{-1}\times9^{-3}\times8\times27$$
$\frac{1}{54}\approx 0.018518519$
$$\frac{1}{16}\times 9^{-3}\times 8\times 27$$
$$\frac{1}{16}\times \frac{1}{729}\times 8\times 27$$
$$\frac{1}{11664}\times 8\times 27$$
$$\frac{1}{1458}\times 27$$
$$\frac{1}{54}$$
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$\frac{1}{2 \cdot 3 ^ {3}} = 0.018518518518518517$