Perfect Square
1806973507437121 is a perfect square (42508511 × 42508511)
1,806,973,507,437,121
One quadrillion, eight hundred and six trillion, nine hundred and seventy-three billion, five hundred and seven million, four hundred and thirty-seven thousand, one hundred and twenty-one.
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Odd
1806973507437121 is odd
Previous odd number is 1806973507437119
Next odd number is 1806973507437123