18995796864 has 128 divisors (see below), whose sum is σ = 61160832000. Its totient is φ = 5756290560.

The previous prime is 18995796823. The next prime is 18995796893. The reversal of 18995796864 is 46869759981.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 18995796792 and 18995796801.

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, 211824 + ... + 287855.

It is an arithmetic number, because the mean of its divisors is an integer number (477819000).

Almost surely, 2^18995796864 is an apocalyptic number.

It is an amenable number.

18995796864 is an abundant number, since it is smaller than the sum of its proper divisors (42165035136).

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

18995796864 is a wasteful number, since it uses less digits than its factorization.

18995796864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499713 (or 499695 counting only the distinct ones).

The product of its digits is 235146240, while the sum is 72.

The spelling of 18995796864 in words is "eighteen billion, nine hundred ninety-five million, seven hundred ninety-six thousand, eight hundred sixty-four".