80917189517 has 2 divisors, whose sum is σ = 80917189518. Its totient is φ = 80917189516.

The previous prime is 80917189501. The next prime is 80917189559. The reversal of 80917189517 is 71598171908.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47063397481 + 33853792036 = 216941^2 + 183994^2 .

It is a cyclic number.

It is not a de Polignac number, because 80917189517 - 2⁴ = 80917189501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80917189567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40458594758 + 40458594759.

It is an arithmetic number, because the mean of its divisors is an integer number (40458594759).

Almost surely, 2^80917189517 is an apocalyptic number.

It is an amenable number.

80917189517 is a deficient number, since it is larger than the sum of its proper divisors (1).

80917189517 is an equidigital number, since it uses as much as digits as its factorization.

80917189517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1270080, while the sum is 56.

The spelling of 80917189517 in words is "eighty billion, nine hundred seventeen million, one hundred eighty-nine thousand, five hundred seventeen".