18916586555664 has 80 divisors (see below), whose sum is σ = 55851399821312. Its totient is φ = 5404503855744.

The previous prime is 18916586555617. The next prime is 18916586555681. The reversal of 18916586555664 is 46655568561981.

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, 6583017 + ... + 9009399.

Almost surely, 2^{18916586555664} is an apocalyptic number.

18916586555664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18916586555664 is an abundant number, since it is smaller than the sum of its proper divisors (36934813265648).

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

18916586555664 is a wasteful number, since it uses less digits than its factorization.

18916586555664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2449604 (or 2449598 counting only the distinct ones).

The product of its digits is 1866240000, while the sum is 75.

The spelling of 18916586555664 in words is "eighteen trillion, nine hundred sixteen billion, five hundred eighty-six million, five hundred fifty-five thousand, six hundred sixty-four".