18065165 has 4 divisors (see below), whose sum is σ = 21678204. Its totient is φ = 14452128.

The previous prime is 18065153. The next prime is 18065171. The reversal of 18065165 is 56156081.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13060996 + 5004169 = 3614^2 + 2237^2 .

It is a cyclic number.

It is not a de Polignac number, because 18065165 - 2²⁰ = 17016589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1806512 + ... + 1806521.

It is an arithmetic number, because the mean of its divisors is an integer number (5419551).

Almost surely, 2^18065165 is an apocalyptic number.

It is an amenable number.

18065165 is a deficient number, since it is larger than the sum of its proper divisors (3613039).

18065165 is an equidigital number, since it uses as much as digits as its factorization.

18065165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3613038.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 18065165 is about 4250.3135178478. The cubic root of 18065165 is about 262.3900189308.

The spelling of 18065165 in words is "eighteen million, sixty-five thousand, one hundred sixty-five".