18955879656 has 64 divisors (see below), whose sum is σ = 54386380800. Its totient is φ = 5393293248.

The previous prime is 18955879619. The next prime is 18955879687. The reversal of 18955879656 is 65697855981.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195900 + ... + 276203.

It is an arithmetic number, because the mean of its divisors is an integer number (849787200).

Almost surely, 2^18955879656 is an apocalyptic number.

It is an amenable number.

18955879656 is an abundant number, since it is smaller than the sum of its proper divisors (35430501144).

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

18955879656 is a wasteful number, since it uses less digits than its factorization.

18955879656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472358 (or 472354 counting only the distinct ones).

The product of its digits is 163296000, while the sum is 69.

The spelling of 18955879656 in words is "eighteen billion, nine hundred fifty-five million, eight hundred seventy-nine thousand, six hundred fifty-six".