$*)\begin{cases}V_{nt}=\frac{4\pi R^3_{nt}}{3} \\ V_{hn}=\frac{4\pi r^3_{hn}}{3} \end{cases}\Rightarrow \begin{cases}V_{nt}=\frac{4.3,14.(0,053.10^{-12})}{3} m^3=...\\V_{hn}=\frac{4.3,14.(10^{-6}.10^{-12})^3}{3} m^3=... \end{cases}$$\Rightarrow \frac{V_{hn}}{V_{nt}}=\frac{R^3_{nt}}{r^3_{hn}}=\frac{(0,053)^3}{(10^{-6})^3}=1,48877.10^{14}$
$*)\begin{cases}D_{nt}=\frac{m_{nt}}{V_{nt}} \\ D_{hn}=\frac{m_{hn}}{V_{hn}} \end{cases} (m_{hn}\approx m_{nt}=1,6726.10^{-27} kg)\Rightarrow \begin{cases}D_{nt}=... \\ D_{hn}=... \end{cases}$
$\Rightarrow \frac{D_{hn}}{D_{nt}}=\frac{V_{nt}}{V_{hn}}=1,48877.10^{14}$