81980962577 has 2 divisors, whose sum is σ = 81980962578. Its totient is φ = 81980962576.

The previous prime is 81980962561. The next prime is 81980962589. The reversal of 81980962577 is 77526908918.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52882061521 + 29098901056 = 229961^2 + 170584^2 .

It is a cyclic number.

It is not a de Polignac number, because 81980962577 - 2⁴ = 81980962561 is a prime.

It is not a weakly prime, because it can be changed into another prime (81980962517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40990481288 + 40990481289.

It is an arithmetic number, because the mean of its divisors is an integer number (40990481289).

Almost surely, 2^81980962577 is an apocalyptic number.

It is an amenable number.

81980962577 is a deficient number, since it is larger than the sum of its proper divisors (1).

81980962577 is an equidigital number, since it uses as much as digits as its factorization.

81980962577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15240960, while the sum is 62.

The spelling of 81980962577 in words is "eighty-one billion, nine hundred eighty million, nine hundred sixty-two thousand, five hundred seventy-seven".