79777945617 has 16 divisors (see below), whose sum is σ = 112682237760. Its totient is φ = 50065134912.

The previous prime is 79777945609. The next prime is 79777945649. The reversal of 79777945617 is 71654977797.

It is not a de Polignac number, because 79777945617 - 2³ = 79777945609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79777945607) 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, 4448418 + ... + 4466315.

It is an arithmetic number, because the mean of its divisors is an integer number (7042639860).

Almost surely, 2^79777945617 is an apocalyptic number.

It is an amenable number.

79777945617 is a deficient number, since it is larger than the sum of its proper divisors (32904292143).

79777945617 is a wasteful number, since it uses less digits than its factorization.

79777945617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8914912.

The product of its digits is 163364040, while the sum is 69.

The spelling of 79777945617 in words is "seventy-nine billion, seven hundred seventy-seven million, nine hundred forty-five thousand, six hundred seventeen".