18937321516 has 6 divisors (see below), whose sum is σ = 33140312660. Its totient is φ = 9468660756.

The previous prime is 18937321511. The next prime is 18937321517. The reversal of 18937321516 is 61512373981.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18937321511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2367165186 + ... + 2367165193.

Almost surely, 2^18937321516 is an apocalyptic number.

It is an amenable number.

18937321516 is a deficient number, since it is larger than the sum of its proper divisors (14202991144).

18937321516 is a wasteful number, since it uses less digits than its factorization.

18937321516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4734330383 (or 4734330381 counting only the distinct ones).

The product of its digits is 272160, while the sum is 46.

The spelling of 18937321516 in words is "eighteen billion, nine hundred thirty-seven million, three hundred twenty-one thousand, five hundred sixteen".