$$1.6\times10^{-19}C.$$
$\frac{C}{6250000000000000000}$
$$1.6\times \frac{1}{10000000000000000000}C$$
$$\frac{1}{6250000000000000000}C$$
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$0.00000000000000000016$
$$\frac{\mathrm{d}}{\mathrm{d}C}(1.6\times \frac{1}{10000000000000000000}C)$$
$$\frac{\mathrm{d}}{\mathrm{d}C}(\frac{1}{6250000000000000000}C)$$
$$\frac{1}{6250000000000000000}C^{1-1}$$
$$\frac{1}{6250000000000000000}C^{0}$$
$$\frac{1}{6250000000000000000}\times 1$$
$$\frac{1}{6250000000000000000}$$