18731444556 has 24 divisors (see below), whose sum is σ = 47680041024. Its totient is φ = 5676195280.

The previous prime is 18731444551. The next prime is 18731444561. The reversal of 18731444556 is 65544413781.

It is an interprime number because it is at equal distance from previous prime (18731444551) and next prime (18731444561).

It is not an unprimeable number, because it can be changed into a prime (18731444551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70952310 + ... + 70952573.

It is an arithmetic number, because the mean of its divisors is an integer number (1986668376).

Almost surely, 2^18731444556 is an apocalyptic number.

It is an amenable number.

18731444556 is an abundant number, since it is smaller than the sum of its proper divisors (28948596468).

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

18731444556 is a wasteful number, since it uses less digits than its factorization.

18731444556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141904901 (or 141904899 counting only the distinct ones).

The product of its digits is 1612800, while the sum is 48.

The spelling of 18731444556 in words is "eighteen billion, seven hundred thirty-one million, four hundred forty-four thousand, five hundred fifty-six".