18916228224 has 96 divisors (see below), whose sum is σ = 54469481040. Its totient is φ = 6301232640.

The previous prime is 18916228181. The next prime is 18916228231. The reversal of 18916228224 is 42282261981.

18916228224 is a `hidden beast` number, since 18 + 9 + 1 + 622 + 8 + 2 + 2 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 18916228224.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2081739 + ... + 2090805.

Almost surely, 2^18916228224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18916228224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27234740520).

18916228224 is an abundant number, since it is smaller than the sum of its proper divisors (35553252816).

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

18916228224 is a wasteful number, since it uses less digits than its factorization.

18916228224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10898 (or 10883 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The spelling of 18916228224 in words is "eighteen billion, nine hundred sixteen million, two hundred twenty-eight thousand, two hundred twenty-four".