18664001 has 4 divisors (see below), whose sum is σ = 18980400. Its totient is φ = 18347604.

The previous prime is 18663941. The next prime is 18664007. The reversal of 18664001 is 10046681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18664001 - 2¹⁰ = 18662977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18664007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158111 + ... + 158228.

It is an arithmetic number, because the mean of its divisors is an integer number (4745100).

Almost surely, 2^18664001 is an apocalyptic number.

It is an amenable number.

18664001 is a deficient number, since it is larger than the sum of its proper divisors (316399).

18664001 is an equidigital number, since it uses as much as digits as its factorization.

18664001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316398.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 18664001 is about 4320.1852969520. The cubic root of 18664001 is about 265.2578527346.

The spelling of 18664001 in words is "eighteen million, six hundred sixty-four thousand, one".