18000066 has 32 divisors (see below), whose sum is σ = 42150528. Its totient is φ = 5016960.

The previous prime is 18000041. The next prime is 18000067. The reversal of 18000066 is 66000081.

It is a Harshad number since it is a multiple of its sum of digits (21).

18000066 is a modest number, since divided by 66 gives 18 as remainder.

It is not an unprimeable number, because it can be changed into a prime (18000067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3505 + ... + 6948.

It is an arithmetic number, because the mean of its divisors is an integer number (1317204).

Almost surely, 2^18000066 is an apocalyptic number.

18000066 is an abundant number, since it is smaller than the sum of its proper divisors (24150462).

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

18000066 is a wasteful number, since it uses less digits than its factorization.

18000066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10506.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 18000066 is about 4242.6484652867. The cubic root of 18000066 is about 262.0744597333.

The spelling of 18000066 in words is "eighteen million, sixty-six", and thus it is an aban number and an uban number.