18013913408 has 28 divisors (see below), whose sum is σ = 35751150240. Its totient is φ = 9005749632.

The previous prime is 18013913399. The next prime is 18013913429. The reversal of 18013913408 is 80431931081.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 641813 + ... + 669291.

Almost surely, 2^18013913408 is an apocalyptic number.

It is an amenable number.

18013913408 is a deficient number, since it is larger than the sum of its proper divisors (17737236832).

18013913408 is a wasteful number, since it uses less digits than its factorization.

18013913408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37734 (or 37724 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The spelling of 18013913408 in words is "eighteen billion, thirteen million, nine hundred thirteen thousand, four hundred eight".