18553819944 has 32 divisors (see below), whose sum is σ = 50601327840. Its totient is φ = 5622369600.

The previous prime is 18553819937. The next prime is 18553819993. The reversal of 18553819944 is 44991835581.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35139547 + ... + 35140074.

It is an arithmetic number, because the mean of its divisors is an integer number (1581291495).

Almost surely, 2^18553819944 is an apocalyptic number.

It is an amenable number.

18553819944 is an abundant number, since it is smaller than the sum of its proper divisors (32047507896).

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

18553819944 is a wasteful number, since it uses less digits than its factorization.

18553819944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70279641 (or 70279637 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 57.

The spelling of 18553819944 in words is "eighteen billion, five hundred fifty-three million, eight hundred nineteen thousand, nine hundred forty-four".