18012665 has 24 divisors (see below), whose sum is σ = 25025280. Its totient is φ = 12402720.

The previous prime is 18012661. The next prime is 18012671. The reversal of 18012665 is 56621081.

It is a happy number.

It is not a de Polignac number, because 18012665 - 2² = 18012661 is a prime.

It is a super-2 number, since 2×18012665² = 648912200804450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18012661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10712 + ... + 12278.

It is an arithmetic number, because the mean of its divisors is an integer number (1042720).

Almost surely, 2^18012665 is an apocalyptic number.

It is an amenable number.

18012665 is a deficient number, since it is larger than the sum of its proper divisors (7012615).

18012665 is a wasteful number, since it uses less digits than its factorization.

18012665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1613 (or 1602 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 18012665 is about 4244.1330092258. The cubic root of 18012665 is about 262.1355911026.

The spelling of 18012665 in words is "eighteen million, twelve thousand, six hundred sixty-five".