79840718165 has 12 divisors (see below), whose sum is σ = 103745691684. Its totient is φ = 58959298944.

The previous prime is 79840718143. The next prime is 79840718171. The reversal of 79840718165 is 56181704897.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 44149573924 + 35691144241 = 210118^2 + 188921^2 .

It is not a de Polignac number, because 79840718165 - 2³⁰ = 78766976341 is a prime.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79840718165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47242184 + ... + 47243873.

It is an arithmetic number, because the mean of its divisors is an integer number (8645474307).

Almost surely, 2^79840718165 is an apocalyptic number.

It is an amenable number.

79840718165 is a deficient number, since it is larger than the sum of its proper divisors (23904973519).

79840718165 is a wasteful number, since it uses less digits than its factorization.

79840718165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94486088 (or 94486075 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 56.

The spelling of 79840718165 in words is "seventy-nine billion, eight hundred forty million, seven hundred eighteen thousand, one hundred sixty-five".