18543648804 has 24 divisors (see below), whose sum is σ = 45545804640. Its totient is φ = 5855889024.

The previous prime is 18543648791. The next prime is 18543648817. The reversal of 18543648804 is 40884634581.

It is an interprime number because it is at equal distance from previous prime (18543648791) and next prime (18543648817).

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 7 ways as a sum of consecutive naturals, for example, 40665669 + ... + 40666124.

It is an arithmetic number, because the mean of its divisors is an integer number (1897741860).

Almost surely, 2^18543648804 is an apocalyptic number.

It is an amenable number.

18543648804 is an abundant number, since it is smaller than the sum of its proper divisors (27002155836).

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

18543648804 is a wasteful number, since it uses less digits than its factorization.

18543648804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81331819 (or 81331817 counting only the distinct ones).

The product of its (nonzero) digits is 2949120, while the sum is 51.

The spelling of 18543648804 in words is "eighteen billion, five hundred forty-three million, six hundred forty-eight thousand, eight hundred four".