18939926664 has 48 divisors (see below), whose sum is σ = 51319307520. Its totient is φ = 6310395360.

The previous prime is 18939926659. The next prime is 18939926711. The reversal of 18939926664 is 46662993981.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99309 + ... + 218499.

It is an arithmetic number, because the mean of its divisors is an integer number (1069152240).

Almost surely, 2^18939926664 is an apocalyptic number.

It is an amenable number.

18939926664 is an abundant number, since it is smaller than the sum of its proper divisors (32379380856).

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

18939926664 is a wasteful number, since it uses less digits than its factorization.

18939926664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121410 (or 121403 counting only the distinct ones).

The product of its digits is 30233088, while the sum is 63.

The spelling of 18939926664 in words is "eighteen billion, nine hundred thirty-nine million, nine hundred twenty-six thousand, six hundred sixty-four".