79665971 has 16 divisors (see below), whose sum is σ = 101637888. Its totient is φ = 60631200.

The previous prime is 79665941. The next prime is 79665991. The reversal of 79665971 is 17956697.

It is not a de Polignac number, because 79665971 - 2²⁶ = 12557107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79665931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8720 + ... + 15341.

It is an arithmetic number, because the mean of its divisors is an integer number (6352368).

Almost surely, 2^79665971 is an apocalyptic number.

79665971 is a deficient number, since it is larger than the sum of its proper divisors (21971917).

79665971 is a wasteful number, since it uses less digits than its factorization.

79665971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24122.

The product of its digits is 714420, while the sum is 50.

The square root of 79665971 is about 8925.5795890239. The cubic root of 79665971 is about 430.2863983514.

The spelling of 79665971 in words is "seventy-nine million, six hundred sixty-five thousand, nine hundred seventy-one".