Perfect Square
1000000000000000000000000 is a perfect square (1000000000000 × 1000000000000)
1000000000000000000000000 is a perfect square (1000000000000 × 1000000000000)
11010011 11000010 00011011 11001110 11001100 11101101 10100001 00000000 00000000 00000000
1000000000000000000000000 is even
Previous even number is 999999999999999999999998
Next even number is 1000000000000000000000002
1000000000000000000000000000000000000000000000000000000000000000000000000