What is 3 to the power of 18 ?What is 3 to the power of 18 ?Solution: 318 = 387,420,489simplify this: All that is needed is to multiply it out:3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 = 387,420,489 So, 3 to the power of 18 is 387,420,489.