18564446472 has 128 divisors (see below), whose sum is σ = 56284139520. Its totient is φ = 5025312000.

The previous prime is 18564446449. The next prime is 18564446477. The reversal of 18564446472 is 27464446581.

It is not an unprimeable number, because it can be changed into a prime (18564446477) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19147 + ... + 193637.

It is an arithmetic number, because the mean of its divisors is an integer number (439719840).

Almost surely, 2^18564446472 is an apocalyptic number.

18564446472 is a gapful number since it is divisible by the number (12) 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 18564446472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28142069760).

18564446472 is an abundant number, since it is smaller than the sum of its proper divisors (37719693048).

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

18564446472 is a wasteful number, since it uses less digits than its factorization.

18564446472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174555 (or 174551 counting only the distinct ones).

The product of its digits is 5160960, while the sum is 51.

The spelling of 18564446472 in words is "eighteen billion, five hundred sixty-four million, four hundred forty-six thousand, four hundred seventy-two".