18465665 has 16 divisors (see below), whose sum is σ = 23262336. Its totient is φ = 14044800.

The previous prime is 18465637. The next prime is 18465679. The reversal of 18465665 is 56656481.

It is a happy number.

It is not a de Polignac number, because 18465665 - 2²⁰ = 17417089 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, 23885 + ... + 24645.

It is an arithmetic number, because the mean of its divisors is an integer number (1453896).

Almost surely, 2^18465665 is an apocalyptic number.

It is an amenable number.

18465665 is a deficient number, since it is larger than the sum of its proper divisors (4796671).

18465665 is a wasteful number, since it uses less digits than its factorization.

18465665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000.

The product of its digits is 172800, while the sum is 41.

The square root of 18465665 is about 4297.1694171862. The cubic root of 18465665 is about 264.3149029642.

The spelling of 18465665 in words is "eighteen million, four hundred sixty-five thousand, six hundred sixty-five".