Power of Two
262 = 4611686018427387904
262 = 4611686018427387904
4611686018427387904 is a perfect square (2147483648 × 2147483648)
4611686018427387904 is even
Previous even number is 4611686018427387902
Next even number is 4611686018427387906
100000000000000000000000000000000000000000000000000000000000000