Perfect Square
666349022140765681 is a perfect square (816302041 × 816302041)
666349022140765681 is a perfect square (816302041 × 816302041)
666349022140765681 is odd
Previous odd number is 666349022140765679
Next odd number is 666349022140765683
1001 0011 1111 0101 1000 1110 0111 1011 1001 0010 0001 0001 0101 1111 0001