18275994816 has 112 divisors (see below), whose sum is σ = 51763574400. Its totient is φ = 5673480192.

The previous prime is 18275994799. The next prime is 18275994827. The reversal of 18275994816 is 61849957281.

It is a self number, because there is not a number n which added to its sum of digits gives 18275994816.

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, 172776 + ... + 257688.

Almost surely, 2^18275994816 is an apocalyptic number.

18275994816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18275994816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25881787200).

18275994816 is an abundant number, since it is smaller than the sum of its proper divisors (33487579584).

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

18275994816 is a wasteful number, since it uses less digits than its factorization.

18275994816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85006 (or 84996 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 60.

The spelling of 18275994816 in words is "eighteen billion, two hundred seventy-five million, nine hundred ninety-four thousand, eight hundred sixteen".