18678605688 has 24 divisors (see below), whose sum is σ = 50587890600. Its totient is φ = 6226201872.

The previous prime is 18678605669. The next prime is 18678605689. The reversal of 18678605688 is 88650687681.

18678605688 is a `hidden beast` number, since 1 + 8 + 6 + 7 + 8 + 60 + 568 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18678605689) 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, 129712468 + ... + 129712611.

It is an arithmetic number, because the mean of its divisors is an integer number (2107828775).

Almost surely, 2^18678605688 is an apocalyptic number.

18678605688 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18678605688 is an abundant number, since it is smaller than the sum of its proper divisors (31909284912).

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

18678605688 is a wasteful number, since it uses less digits than its factorization.

18678605688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259425091 (or 259425084 counting only the distinct ones).

The product of its (nonzero) digits is 30965760, while the sum is 63.

The spelling of 18678605688 in words is "eighteen billion, six hundred seventy-eight million, six hundred five thousand, six hundred eighty-eight".