79009440657 has 16 divisors (see below), whose sum is σ = 120591761280. Its totient is φ = 45074593152.

The previous prime is 79009440649. The next prime is 79009440677. The reversal of 79009440657 is 75604490097.

It is not a de Polignac number, because 79009440657 - 2³ = 79009440649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79009440677) 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, 3055932 + ... + 3081677.

It is an arithmetic number, because the mean of its divisors is an integer number (7536985080).

Almost surely, 2^79009440657 is an apocalyptic number.

It is an amenable number.

79009440657 is a deficient number, since it is larger than the sum of its proper divisors (41582320623).

79009440657 is a wasteful number, since it uses less digits than its factorization.

79009440657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6138232.

The product of its (nonzero) digits is 1905120, while the sum is 51.

The spelling of 79009440657 in words is "seventy-nine billion, nine million, four hundred forty thousand, six hundred fifty-seven".