18539117544 has 32 divisors (see below), whose sum is σ = 46472073120. Its totient is φ = 6163135296.

The previous prime is 18539117533. The next prime is 18539117561. The reversal of 18539117544 is 44571193581.

It is a junction number, because it is equal to n+sod(n) for n = 18539117493 and 18539117502.

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, 1026522 + ... + 1044425.

It is an arithmetic number, because the mean of its divisors is an integer number (1452252285).

Almost surely, 2^18539117544 is an apocalyptic number.

It is an amenable number.

18539117544 is an abundant number, since it is smaller than the sum of its proper divisors (27932955576).

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

18539117544 is a wasteful number, since it uses less digits than its factorization.

18539117544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2071329 (or 2071325 counting only the distinct ones).

The product of its digits is 604800, while the sum is 48.

The spelling of 18539117544 in words is "eighteen billion, five hundred thirty-nine million, one hundred seventeen thousand, five hundred forty-four".