18115229440 has 576 divisors, whose sum is σ = 57454387200. Its totient is φ = 5464166400.

The previous prime is 18115229437. The next prime is 18115229441. The reversal of 18115229440 is 4492251181.

It is a self number, because there is not a number n which added to its sum of digits gives 18115229440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18115229441) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 584362225 + ... + 584362255.

It is an arithmetic number, because the mean of its divisors is an integer number (99747200).

Almost surely, 2^18115229440 is an apocalyptic number.

18115229440 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 18115229440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28727193600).

18115229440 is an abundant number, since it is smaller than the sum of its proper divisors (39339157760).

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

18115229440 is an frugal number, since it uses more digits than its factorization.

18115229440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 56 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The spelling of 18115229440 in words is "eighteen billion, one hundred fifteen million, two hundred twenty-nine thousand, four hundred forty".