18188585009 has 4 divisors (see below), whose sum is σ = 20786954304. Its totient is φ = 15590215716.

The previous prime is 18188585003. The next prime is 18188585011. The reversal of 18188585009 is 90058588181.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90058588181 = 56443 ⋅1595567.

It is a cyclic number.

It is not a de Polignac number, because 18188585009 - 2⁸ = 18188584753 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 (18188585003) 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, 1299184637 + ... + 1299184650.

It is an arithmetic number, because the mean of its divisors is an integer number (5196738576).

Almost surely, 2^18188585009 is an apocalyptic number.

It is an amenable number.

18188585009 is a deficient number, since it is larger than the sum of its proper divisors (2598369295).

18188585009 is an equidigital number, since it uses as much as digits as its factorization.

18188585009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2598369294.

The product of its (nonzero) digits is 921600, while the sum is 53.

The spelling of 18188585009 in words is "eighteen billion, one hundred eighty-eight million, five hundred eighty-five thousand, nine".