79447856767 has 4 divisors (see below), whose sum is σ = 80453525920. Its totient is φ = 78442187616.

The previous prime is 79447856707. The next prime is 79447856771. The reversal of 79447856767 is 76765874497.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76765874497 = 13 ⋅5905067269.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79447856767 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 79447856696 and 79447856705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79447856707) 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, 502834458 + ... + 502834615.

It is an arithmetic number, because the mean of its divisors is an integer number (20113381480).

Almost surely, 2^79447856767 is an apocalyptic number.

79447856767 is a deficient number, since it is larger than the sum of its proper divisors (1005669153).

79447856767 is a wasteful number, since it uses less digits than its factorization.

79447856767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005669152.

The product of its digits is 497871360, while the sum is 70.

The spelling of 79447856767 in words is "seventy-nine billion, four hundred forty-seven million, eight hundred fifty-six thousand, seven hundred sixty-seven".