82188665 has 16 divisors (see below), whose sum is σ = 108476928. Its totient is φ = 59399616.

The previous prime is 82188647. The next prime is 82188679. The reversal of 82188665 is 56688128.

It is a cyclic number.

It is not a de Polignac number, because 82188665 - 2¹⁰ = 82187641 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10397 + ... + 16506.

It is an arithmetic number, because the mean of its divisors is an integer number (6779808).

Almost surely, 2^82188665 is an apocalyptic number.

It is an amenable number.

82188665 is a deficient number, since it is larger than the sum of its proper divisors (26288263).

82188665 is a wasteful number, since it uses less digits than its factorization.

82188665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26968.

The product of its digits is 184320, while the sum is 44.

The square root of 82188665 is about 9065.7964349526. The cubic root of 82188665 is about 434.7810850751.

The spelling of 82188665 in words is "eighty-two million, one hundred eighty-eight thousand, six hundred sixty-five".