18506479916 has 12 divisors (see below), whose sum is σ = 32389439040. Its totient is φ = 9252354480.

The previous prime is 18506479907. The next prime is 18506479931. The reversal of 18506479916 is 61997460581.

It is a super-2 number, since 2×18506479916² (a number of 21 digits) contains 22 as substring.

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, 173180 + ... + 258851.

It is an arithmetic number, because the mean of its divisors is an integer number (2699119920).

Almost surely, 2^18506479916 is an apocalyptic number.

It is an amenable number.

18506479916 is a deficient number, since it is larger than the sum of its proper divisors (13882959124).

18506479916 is a wasteful number, since it uses less digits than its factorization.

18506479916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442744 (or 442742 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 56.

The spelling of 18506479916 in words is "eighteen billion, five hundred six million, four hundred seventy-nine thousand, nine hundred sixteen".