18876937689 has 6 divisors (see below), whose sum is σ = 27266687786. Its totient is φ = 12584625120.

The previous prime is 18876937687. The next prime is 18876937697. The reversal of 18876937689 is 98673967881.

18876937689 is a `hidden beast` number, since 188 + 76 + 9 + 376 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17831062089 + 1045875600 = 133533^2 + 32340^2 .

It is not a de Polignac number, because 18876937689 - 2¹ = 18876937687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18876937687) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1048718752 + ... + 1048718769.

Almost surely, 2^18876937689 is an apocalyptic number.

It is an amenable number.

18876937689 is a deficient number, since it is larger than the sum of its proper divisors (8389750097).

18876937689 is a wasteful number, since it uses less digits than its factorization.

18876937689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2097437527 (or 2097437524 counting only the distinct ones).

The product of its digits is 219469824, while the sum is 72.

The spelling of 18876937689 in words is "eighteen billion, eight hundred seventy-six million, nine hundred thirty-seven thousand, six hundred eighty-nine".