78979922813 has 16 divisors (see below), whose sum is σ = 89608972992. Its totient is φ = 68980464000.

The previous prime is 78979922803. The next prime is 78979922831. The reversal of 78979922813 is 31822997987.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 78979922813 - 2⁸ = 78979922557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78979922813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78979922803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1339808 + ... + 1397513.

It is an arithmetic number, because the mean of its divisors is an integer number (5600560812).

Almost surely, 2^78979922813 is an apocalyptic number.

It is an amenable number.

78979922813 is a deficient number, since it is larger than the sum of its proper divisors (10629050179).

78979922813 is a wasteful number, since it uses less digits than its factorization.

78979922813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2737436.

The product of its digits is 27433728, while the sum is 65.

The spelling of 78979922813 in words is "seventy-eight billion, nine hundred seventy-nine million, nine hundred twenty-two thousand, eight hundred thirteen".