18664165 has 8 divisors (see below), whose sum is σ = 24119928. Its totient is φ = 13782720.

The previous prime is 18664157. The next prime is 18664183. The reversal of 18664165 is 56146681.

It can be written as a sum of positive squares in 4 ways, for example, as 2455489 + 16208676 = 1567^2 + 4026^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18664165 - 2³ = 18664157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143506 + ... + 143635.

It is an arithmetic number, because the mean of its divisors is an integer number (3014991).

Almost surely, 2^18664165 is an apocalyptic number.

It is an amenable number.

18664165 is a deficient number, since it is larger than the sum of its proper divisors (5455763).

18664165 is a wasteful number, since it uses less digits than its factorization.

18664165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287159.

The product of its digits is 34560, while the sum is 37.

The square root of 18664165 is about 4320.2042775776. The cubic root of 18664165 is about 265.2586296699.

The spelling of 18664165 in words is "eighteen million, six hundred sixty-four thousand, one hundred sixty-five".