18189444480 has 128 divisors (see below), whose sum is σ = 58039999200. Its totient is φ = 4845404160.

The previous prime is 18189444461. The next prime is 18189444569. The reversal of 18189444480 is 8444498181.

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

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, 2032656 + ... + 2041584.

Almost surely, 2^18189444480 is an apocalyptic number.

18189444480 is a gapful number since it is divisible by the number (10) 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 18189444480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29019999600).

18189444480 is an abundant number, since it is smaller than the sum of its proper divisors (39850554720).

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

18189444480 is a wasteful number, since it uses less digits than its factorization.

18189444480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10012 (or 10000 counting only the distinct ones).

The product of its (nonzero) digits is 1179648, while the sum is 51.

The spelling of 18189444480 in words is "eighteen billion, one hundred eighty-nine million, four hundred forty-four thousand, four hundred eighty".