18165065 has 4 divisors (see below), whose sum is σ = 21798084. Its totient is φ = 14532048.

The previous prime is 18165047. The next prime is 18165073. The reversal of 18165065 is 56056181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56056181 = 1319 ⋅42499.

It can be written as a sum of positive squares in 2 ways, for example, as 5626384 + 12538681 = 2372^2 + 3541^2 .

It is a cyclic number.

It is not a de Polignac number, because 18165065 - 2⁶ = 18165001 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1816502 + ... + 1816511.

It is an arithmetic number, because the mean of its divisors is an integer number (5449521).

Almost surely, 2^18165065 is an apocalyptic number.

It is an amenable number.

18165065 is a deficient number, since it is larger than the sum of its proper divisors (3633019).

18165065 is an equidigital number, since it uses as much as digits as its factorization.

18165065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3633018.

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

The square root of 18165065 is about 4262.0493896716. The cubic root of 18165065 is about 262.8728006105.

The spelling of 18165065 in words is "eighteen million, one hundred sixty-five thousand, sixty-five".