18000666 has 12 divisors (see below), whose sum is σ = 39001482. Its totient is φ = 6000216.

The previous prime is 18000649. The next prime is 18000679. The reversal of 18000666 is 66600081.

It can be written as a sum of positive squares in only one way, i.e., 11390625 + 6610041 = 3375^2 + 2571^2 .

18000666 is a modest number, since divided by 666 gives 18 as remainder.

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 5 ways as a sum of consecutive naturals, for example, 500001 + ... + 500036.

Almost surely, 2^18000666 is an apocalyptic number.

18000666 is an abundant number, since it is smaller than the sum of its proper divisors (21000816).

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

18000666 is a wasteful number, since it uses less digits than its factorization.

18000666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000045 (or 1000042 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 18000666 is about 4242.7191752460. The cubic root of 18000666 is about 262.0773716287.

The spelling of 18000666 in words is "eighteen million, six hundred sixty-six", and thus it is an aban number.