G1.3 Let $n$ be the product 3659893456789325678 and 342973489379256 . Determine the number of digits of $n$.
$$
\begin{array}{l}
\text { Let } x=3659893456789325678, y=342973489379256 \\
x=3.7 \times 10^{18}, y=3.4 \times 10^{14} \text { (correct to } 2 \text { sig. fig.) } \\
n=x y=3.7 \times 10^{18} \times 3.4 \times 10^{14}=12.58 \times 10^{32}=1.258 \times 10^{33}
\end{array}
$$

The number of digits of $n$ is 34 .