18408332544 has 360 divisors, whose sum is σ = 58397488800. Its totient is φ = 5146251264.

The previous prime is 18408332543. The next prime is 18408332623. The reversal of 18408332544 is 44523380481.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 18408332496 and 18408332505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18408332543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 123545782 + ... + 123545930.

Almost surely, 2^18408332544 is an apocalyptic number.

18408332544 is a gapful number since it is divisible by the number (14) 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 18408332544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29198744400).

18408332544 is an abundant number, since it is smaller than the sum of its proper divisors (39989156256).

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

18408332544 is an frugal number, since it uses more digits than its factorization.

18408332544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 42.

The spelling of 18408332544 in words is "eighteen billion, four hundred eight million, three hundred thirty-two thousand, five hundred forty-four".