18876685617 has 12 divisors (see below), whose sum is σ = 27267995664. Its totient is φ = 12583685400.

The previous prime is 18876685589. The next prime is 18876685621. The reversal of 18876685617 is 71658667881.

18876685617 is a `hidden beast` number, since 1 + 8 + 8 + 7 + 6 + 6 + 8 + 5 + 617 = 666.

It is not a de Polignac number, because 18876685617 - 2²⁸ = 18608250161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18876685697) 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, 117742 + ... + 227192.

It is an arithmetic number, because the mean of its divisors is an integer number (2272332972).

Almost surely, 2^18876685617 is an apocalyptic number.

It is an amenable number.

18876685617 is a deficient number, since it is larger than the sum of its proper divisors (8391310047).

18876685617 is a wasteful number, since it uses less digits than its factorization.

18876685617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128620 (or 128617 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 63.

The spelling of 18876685617 in words is "eighteen billion, eight hundred seventy-six million, six hundred eighty-five thousand, six hundred seventeen".