Perfect Square
668964975525589681 is a perfect square (817902791 × 817902791)
668964975525589681 is a perfect square (817902791 × 817902791)
668964975525589681 is odd
Previous odd number is 668964975525589679
Next odd number is 668964975525589683
1001 0100 1000 1010 0100 0001 1001 1101 0101 0110 0001 0111 0010 1011 0001