18218444832 has 192 divisors, whose sum is σ = 61479532800. Its totient is φ = 5205129984.

The previous prime is 18218444819. The next prime is 18218444851. The reversal of 18218444832 is 23844481281.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 471294 + ... + 508482.

It is an arithmetic number, because the mean of its divisors is an integer number (320205900).

Almost surely, 2^18218444832 is an apocalyptic number.

18218444832 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 18218444832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30739766400).

18218444832 is an abundant number, since it is smaller than the sum of its proper divisors (43261087968).

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

18218444832 is an frugal number, since it uses more digits than its factorization.

18218444832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37227 (or 37201 counting only the distinct ones).

The product of its digits is 393216, while the sum is 45.

The spelling of 18218444832 in words is "eighteen billion, two hundred eighteen million, four hundred forty-four thousand, eight hundred thirty-two".