18688178934 has 24 divisors (see below), whose sum is σ = 40508368992. Its totient is φ = 6226729200.

The previous prime is 18688178917. The next prime is 18688178941. The reversal of 18688178934 is 43987188681.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 178489 + ... + 263124.

It is an arithmetic number, because the mean of its divisors is an integer number (1687848708).

Almost surely, 2^18688178934 is an apocalyptic number.

18688178934 is an abundant number, since it is smaller than the sum of its proper divisors (21820190058).

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

18688178934 is a wasteful number, since it uses less digits than its factorization.

18688178934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443972 (or 443969 counting only the distinct ones).

The product of its digits is 18579456, while the sum is 63.

The spelling of 18688178934 in words is "eighteen billion, six hundred eighty-eight million, one hundred seventy-eight thousand, nine hundred thirty-four".