Perfect Square
6409390983925011788325702415483657061218015641 is a perfect square (80058672134410347015621 × 80058672134410347015621)
6409390983925011788325702415483657061218015641 is a perfect square (80058672134410347015621 × 80058672134410347015621)
6409390983925011788325702415483657061218015641 is odd
Previous odd number is 6409390983925011788325702415483657061218015639
Next odd number is 6409390983925011788325702415483657061218015643
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