3.9 * 10^33 * 2.45 * 10^5 =
= 3.9 * 2.45 * 10^33 * 10^5
= 9.555 * 10^(33 + 5)
= 9.555 * 10^38
3.9 * 2.45 = 9.555
10^33 * 10^5 = 10^38
The answer is 9.555 . 10^38
