18899856056 has 32 divisors (see below), whose sum is σ = 38170828800. Its totient is φ = 8747476320.

The previous prime is 18899855939. The next prime is 18899856061. The reversal of 18899856056 is 65065899881.

It is a junction number, because it is equal to n+sod(n) for n = 18899855983 and 18899856001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1651016 + ... + 1662423.

It is an arithmetic number, because the mean of its divisors is an integer number (1192838400).

Almost surely, 2^18899856056 is an apocalyptic number.

It is an amenable number.

18899856056 is an abundant number, since it is smaller than the sum of its proper divisors (19270972744).

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

18899856056 is a wasteful number, since it uses less digits than its factorization.

18899856056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3313499 (or 3313495 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 65.

The spelling of 18899856056 in words is "eighteen billion, eight hundred ninety-nine million, eight hundred fifty-six thousand, fifty-six".