18891958868 has 48 divisors (see below), whose sum is σ = 35690941440. Its totient is φ = 8724249600.

The previous prime is 18891958843. The next prime is 18891958907. The reversal of 18891958868 is 86885919881.

It is a super-2 number, since 2×18891958868² (a number of 21 digits) contains 22 as substring.

It is a congruent 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, 1307588 + ... + 1321956.

It is an arithmetic number, because the mean of its divisors is an integer number (743561280).

Almost surely, 2^18891958868 is an apocalyptic number.

It is an amenable number.

18891958868 is a deficient number, since it is larger than the sum of its proper divisors (16798982572).

18891958868 is a wasteful number, since it uses less digits than its factorization.

18891958868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14888 (or 14886 counting only the distinct ones).

The product of its digits is 79626240, while the sum is 71.

The spelling of 18891958868 in words is "eighteen billion, eight hundred ninety-one million, nine hundred fifty-eight thousand, eight hundred sixty-eight".