18711678656 has 28 divisors (see below), whose sum is σ = 40506533160. Its totient is φ = 8505308160.

The previous prime is 18711678641. The next prime is 18711678697. The reversal of 18711678656 is 65687611781.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13288841 + ... + 13290248.

Almost surely, 2^18711678656 is an apocalyptic number.

18711678656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18711678656 is an abundant number, since it is smaller than the sum of its proper divisors (21794854504).

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

18711678656 is a wasteful number, since it uses less digits than its factorization.

18711678656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26579112 (or 26579102 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 56.

The spelling of 18711678656 in words is "eighteen billion, seven hundred eleven million, six hundred seventy-eight thousand, six hundred fifty-six".