18938899064 has 16 divisors (see below), whose sum is σ = 35665506600. Its totient is φ = 9428097312.

The previous prime is 18938899061. The next prime is 18938899087. The reversal of 18938899064 is 46099883981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18938899061) 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, 5167082 + ... + 5170745.

Almost surely, 2^18938899064 is an apocalyptic number.

It is an amenable number.

18938899064 is a deficient number, since it is larger than the sum of its proper divisors (16726607536).

18938899064 is a wasteful number, since it uses less digits than its factorization.

18938899064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10338062 (or 10338058 counting only the distinct ones).

The product of its (nonzero) digits is 26873856, while the sum is 65.

The spelling of 18938899064 in words is "eighteen billion, nine hundred thirty-eight million, eight hundred ninety-nine thousand, sixty-four".