18165085 has 4 divisors (see below), whose sum is σ = 21798108. Its totient is φ = 14532064.

The previous prime is 18165079. The next prime is 18165127. The reversal of 18165085 is 58056181.

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 6625476 + 11539609 = 2574^2 + 3397^2 .

It is a cyclic number.

It is not a de Polignac number, because 18165085 - 2⁷ = 18164957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18165085.

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 3 ways as a sum of consecutive naturals, for example, 1816504 + ... + 1816513.

It is an arithmetic number, because the mean of its divisors is an integer number (5449527).

Almost surely, 2^18165085 is an apocalyptic number.

It is an amenable number.

18165085 is a deficient number, since it is larger than the sum of its proper divisors (3633023).

18165085 is an equidigital number, since it uses as much as digits as its factorization.

18165085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3633022.

The product of its (nonzero) digits is 9600, while the sum is 34.

The square root of 18165085 is about 4262.0517359600. The cubic root of 18165085 is about 262.8728970861.

The spelling of 18165085 in words is "eighteen million, one hundred sixty-five thousand, eighty-five".