18666001 has 8 divisors (see below), whose sum is σ = 18972800. Its totient is φ = 18361728.

The previous prime is 18665993. The next prime is 18666023. The reversal of 18666001 is 10066681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18666001 - 2³ = 18665993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18666071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18820 + ... + 19786.

It is an arithmetic number, because the mean of its divisors is an integer number (2371600).

Almost surely, 2^18666001 is an apocalyptic number.

It is an amenable number.

18666001 is a deficient number, since it is larger than the sum of its proper divisors (306799).

18666001 is an equidigital number, since it uses as much as digits as its factorization.

18666001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 18666001 is about 4320.4167623043. The cubic root of 18666001 is about 265.2673272440.

The spelling of 18666001 in words is "eighteen million, six hundred sixty-six thousand, one".