What is 5 to the power of 15 ?What is 5 to the power of 15 ?Solution: 515 = 30,517,578,125simplify this: All that is needed is to multiply it out:5 x 5 x 5 x 5 x 5 x 5 x 5 x 5 x 5 x 5 x 5 x 5 x 5 x 5 x 5 = 30,517,578,125 So, 5 to the power of 15 is 30,517,578,125.