Perfect Square
18681749973121 is a perfect square (4322239 × 4322239)
18,681,749,973,121
Eighteen trillion, six hundred and eighty-one billion, seven hundred and forty-nine million, nine hundred and seventy-three thousand, one hundred and twenty-one.
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Odd
18681749973121 is odd
Previous odd number is 18681749973119
Next odd number is 18681749973123