78572865793 has 4 divisors (see below), whose sum is σ = 78686575408. Its totient is φ = 78459156180.

The previous prime is 78572865691. The next prime is 78572865799. The reversal of 78572865793 is 39756827587.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78572865793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78572865799) 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, 56853771 + ... + 56855152.

It is an arithmetic number, because the mean of its divisors is an integer number (19671643852).

Almost surely, 2^78572865793 is an apocalyptic number.

It is an amenable number.

78572865793 is a deficient number, since it is larger than the sum of its proper divisors (113709615).

78572865793 is a wasteful number, since it uses less digits than its factorization.

78572865793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113709614.

The product of its digits is 177811200, while the sum is 67.

The spelling of 78572865793 in words is "seventy-eight billion, five hundred seventy-two million, eight hundred sixty-five thousand, seven hundred ninety-three".