18665065 has 12 divisors (see below), whose sum is σ = 23794956. Its totient is φ = 14052608.

The previous prime is 18665039. The next prime is 18665071. The reversal of 18665065 is 56056681.

It can be written as a sum of positive squares in 6 ways, for example, as 1125721 + 17539344 = 1061^2 + 4188^2 .

It is not a de Polignac number, because 18665065 - 2⁵ = 18665033 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 11 ways as a sum of consecutive naturals, for example, 5014 + ... + 7903.

It is an arithmetic number, because the mean of its divisors is an integer number (1982913).

Almost surely, 2^18665065 is an apocalyptic number.

It is an amenable number.

18665065 is a deficient number, since it is larger than the sum of its proper divisors (5129891).

18665065 is a wasteful number, since it uses less digits than its factorization.

18665065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12956 (or 12939 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 18665065 is about 4320.3084380632. The cubic root of 18665065 is about 265.2628932579.

The spelling of 18665065 in words is "eighteen million, six hundred sixty-five thousand, sixty-five".