79665 has 16 divisors (see below), whose sum is σ = 131328. Its totient is φ = 41216.

The previous prime is 79657. The next prime is 79669. The reversal of 79665 is 56697.

79665 is nontrivially palindromic in base 16.

It is a cyclic number.

It is not a de Polignac number, because 79665 - 2³ = 79657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79669) 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, 649 + ... + 761.

It is an arithmetic number, because the mean of its divisors is an integer number (8208).

2⁷⁹⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

79665 is a deficient number, since it is larger than the sum of its proper divisors (51663).

79665 is a wasteful number, since it uses less digits than its factorization.

79665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168.

The product of its digits is 11340, while the sum is 33.

The square root of 79665 is about 282.2498892825. The cubic root of 79665 is about 43.0284650178.

It can be divided in two parts, 796 and 65, that added together give a triangular number (861 = T₄₁).

The spelling of 79665 in words is "seventy-nine thousand, six hundred sixty-five".