78979858511 has 4 divisors (see below), whose sum is σ = 79264984632. Its totient is φ = 78694732392.

The previous prime is 78979858481. The next prime is 78979858537. The reversal of 78979858511 is 11585897987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11585897987 = 17 ⋅681523411.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78979858511 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 (78979828511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142562645 + ... + 142563198.

It is an arithmetic number, because the mean of its divisors is an integer number (19816246158).

Almost surely, 2^78979858511 is an apocalyptic number.

78979858511 is a deficient number, since it is larger than the sum of its proper divisors (285126121).

78979858511 is a wasteful number, since it uses less digits than its factorization.

78979858511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285126120.

The product of its digits is 50803200, while the sum is 68.

The spelling of 78979858511 in words is "seventy-eight billion, nine hundred seventy-nine million, eight hundred fifty-eight thousand, five hundred eleven".