Find number of digits

Here $2^5$ $\times$ $5^6$ $\times$ $10^9 = 2^5$ $\times$ $5^5 \times 10^9 \times 5$
$=(2\times5)^5 \times 10^9 \times 5$ $=10^5 \times 10^9 \times 5$ $=10^{14} \times 5$
Clearly there are $15$ digits in $10^{14} \times 5$ .

2^5x5^6= 6 digits......... So, that six digit multiplied by 10^9(which have 9 digit) gives 15 digits............