18339791256 has 112 divisors (see below), whose sum is σ = 51633232560. Its totient is φ = 6104237760.

The previous prime is 18339791251. The next prime is 18339791269. The reversal of 18339791256 is 65219793381.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18339791251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 4797826 + ... + 4801646.

It is an arithmetic number, because the mean of its divisors is an integer number (461011005).

Almost surely, 2^18339791256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18339791256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25816616280).

18339791256 is an abundant number, since it is smaller than the sum of its proper divisors (33293441304).

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

18339791256 is an equidigital number, since it uses as much as digits as its factorization.

18339791256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4668 (or 4649 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The spelling of 18339791256 in words is "eighteen billion, three hundred thirty-nine million, seven hundred ninety-one thousand, two hundred fifty-six".