Perfect Square
664671386902463721 is a perfect square (815273811 × 815273811)
664671386902463721 is a perfect square (815273811 × 815273811)
664671386902463721 is odd
Previous odd number is 664671386902463719
Next odd number is 664671386902463723
1001 0011 1001 0110 0011 0001 1010 1101 0100 1011 0000 0000 0100 1110 1001