18045666 has 28 divisors (see below), whose sum is σ = 40587462. Its totient is φ = 6014736.

The previous prime is 18045661. The next prime is 18045667. The reversal of 18045666 is 66654081.

It can be written as a sum of positive squares in only one way, i.e., 17514225 + 531441 = 4185^2 + 729^2 .

It is a super-2 number, since 2×18045666² = 651292122767112, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18045666.

It is not an unprimeable number, because it can be changed into a prime (18045661) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 4731 + ... + 7646.

Almost surely, 2^18045666 is an apocalyptic number.

18045666 is an abundant number, since it is smaller than the sum of its proper divisors (22541796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18045666 is an equidigital number, since it uses as much as digits as its factorization.

18045666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12397 (or 12382 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 18045666 is about 4248.0190677538. The cubic root of 18045666 is about 262.2955796256.

The spelling of 18045666 in words is "eighteen million, forty-five thousand, six hundred sixty-six".