Perfect Square
6645974909076801 is a perfect square (81522849 × 81522849)
6,645,974,909,076,801
Six quadrillion, six hundred and forty-five trillion, nine hundred and seventy-four billion, nine hundred and nine million, seventy-six thousand, eight hundred and one.
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Odd
6645974909076801 is odd
Previous odd number is 6645974909076799
Next odd number is 6645974909076803