79157815089 has 4 divisors (see below), whose sum is σ = 105543753456. Its totient is φ = 52771876724.

The previous prime is 79157815081. The next prime is 79157815123. The reversal of 79157815089 is 98051875197.

It is a happy number.

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 not a de Polignac number, because 79157815089 - 2³ = 79157815081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79157815081) 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, 13192969179 + ... + 13192969184.

It is an arithmetic number, because the mean of its divisors is an integer number (26385938364).

Almost surely, 2^79157815089 is an apocalyptic number.

It is an amenable number.

79157815089 is a deficient number, since it is larger than the sum of its proper divisors (26385938367).

79157815089 is a wasteful number, since it uses less digits than its factorization.

79157815089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26385938366.

The product of its (nonzero) digits is 6350400, while the sum is 60.

The spelling of 79157815089 in words is "seventy-nine billion, one hundred fifty-seven million, eight hundred fifteen thousand, eighty-nine".