Perfect Square
664671396685749489 is a perfect square (815273817 × 815273817)
664671396685749489 is a perfect square (815273817 × 815273817)
664671396685749489 is odd
Previous odd number is 664671396685749487
Next odd number is 664671396685749491
1001 0011 1001 0110 0011 0001 1101 0001 1011 1101 0001 0001 1100 1111 0001