18442439680 has 528 divisors, whose sum is σ = 55949914080. Its totient is φ = 5796790272.

The previous prime is 18442439599. The next prime is 18442439689. The reversal of 18442439680 is 8693424481.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (18442439689) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 252636124 + ... + 252636196.

Almost surely, 2^18442439680 is an apocalyptic number.

18442439680 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 18442439680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27974957040).

18442439680 is an abundant number, since it is smaller than the sum of its proper divisors (37507474400).

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

18442439680 is a wasteful number, since it uses less digits than its factorization.

18442439680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184 (or 159 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 49.

The spelling of 18442439680 in words is "eighteen billion, four hundred forty-two million, four hundred thirty-nine thousand, six hundred eighty".