80716579517 has 6 divisors (see below), whose sum is σ = 93894796638. Its totient is φ = 69185639544.

The previous prime is 80716579459. The next prime is 80716579553. The reversal of 80716579517 is 71597561708.

It can be written as a sum of positive squares in only one way, i.e., 48811832356 + 31904747161 = 220934^2 + 178619^2 .

It is not a de Polignac number, because 80716579517 - 2¹⁶ = 80716513981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80716579577) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 823638518 + ... + 823638615.

It is an arithmetic number, because the mean of its divisors is an integer number (15649132773).

Almost surely, 2^80716579517 is an apocalyptic number.

It is an amenable number.

80716579517 is a deficient number, since it is larger than the sum of its proper divisors (13178217121).

80716579517 is a wasteful number, since it uses less digits than its factorization.

80716579517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647277147 (or 1647277140 counting only the distinct ones).

The product of its (nonzero) digits is 3704400, while the sum is 56.

The spelling of 80716579517 in words is "eighty billion, seven hundred sixteen million, five hundred seventy-nine thousand, five hundred seventeen".