Perfect Square
665043937696112121 is a perfect square (815502261 × 815502261)
665043937696112121 is a perfect square (815502261 × 815502261)
665043937696112121 is odd
Previous odd number is 665043937696112119
Next odd number is 665043937696112123
1001 0011 1010 1011 0101 1111 0000 0001 0010 0110 0111 0101 1101 1111 1001