18214643187 has 12 divisors (see below), whose sum is σ = 28333889584. Its totient is φ = 11209011120.

The previous prime is 18214643129. The next prime is 18214643197. The reversal of 18214643187 is 78134641281.

18214643187 is a `hidden beast` number, since 1 + 8 + 2 + 1 + 464 + 3 + 187 = 666.

It is not a de Polignac number, because 18214643187 - 2²⁰ = 18213594611 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18214643197) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77840239 + ... + 77840472.

Almost surely, 2^18214643187 is an apocalyptic number.

18214643187 is a deficient number, since it is larger than the sum of its proper divisors (10119246397).

18214643187 is a wasteful number, since it uses less digits than its factorization.

18214643187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155680730 (or 155680727 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The spelling of 18214643187 in words is "eighteen billion, two hundred fourteen million, six hundred forty-three thousand, one hundred eighty-seven".