18981006156 has 96 divisors (see below), whose sum is σ = 59200064000. Its totient is φ = 5137712064.

The previous prime is 18981006131. The next prime is 18981006199. The reversal of 18981006156 is 65160018981.

18981006156 is a `hidden beast` number, since 18 + 9 + 8 + 10 + 0 + 615 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 646351 + ... + 675078.

Almost surely, 2^18981006156 is an apocalyptic number.

It is an amenable number.

18981006156 is an abundant number, since it is smaller than the sum of its proper divisors (40219057844).

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

18981006156 is a wasteful number, since it uses less digits than its factorization.

18981006156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321468 (or 1321460 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The spelling of 18981006156 in words is "eighteen billion, nine hundred eighty-one million, six thousand, one hundred fifty-six".