The cube of 1 is 1(1 * 1 * 1 = 1)
The cube of 2 is 8 (2 * 2 * 2 = 8)
The cube of 3 is 27 (3 * 3 * 3 = 27)
The cube of 4 is 64 (4 * 4 * 4 = 64)
The cube of 5 is 125 (5 * 5 * 5 = 125
The next number would be 216
because it is the cube of 6 (6 * 6 * 6 = 216)