The answer is very simple to get if you have a calculator. You first multiply \(3.6\) and \(7.35\). You should get 26.46, now you move one decimal to the front which means you are multiplying 10 to it. Now you can refer the rest from below:
\(2.646 * 10^{1} * 10^{9} * 10^{5}\) Add the powers of ten
\(2.646 * 10^{1+9+5}\)
\(2.646 * 10^{15}\) This is your answer =)
