80971939577 has 2 divisors, whose sum is σ = 80971939578. Its totient is φ = 80971939576.

The previous prime is 80971939549. The next prime is 80971939681. The reversal of 80971939577 is 77593917908.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67075302121 + 13896637456 = 258989^2 + 117884^2 .

It is a cyclic number.

It is not a de Polignac number, because 80971939577 - 2²⁸ = 80703504121 is a prime.

It is a super-2 number, since 2×80971939577² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (80971939877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40485969788 + 40485969789.

It is an arithmetic number, because the mean of its divisors is an integer number (40485969789).

Almost surely, 2^80971939577 is an apocalyptic number.

It is an amenable number.

80971939577 is a deficient number, since it is larger than the sum of its proper divisors (1).

80971939577 is an equidigital number, since it uses as much as digits as its factorization.

80971939577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30005640, while the sum is 65.

The spelling of 80971939577 in words is "eighty billion, nine hundred seventy-one million, nine hundred thirty-nine thousand, five hundred seventy-seven".