18519729344 has 56 divisors (see below), whose sum is σ = 37967107200. Its totient is φ = 8953712640.

The previous prime is 18519729307. The next prime is 18519729373. The reversal of 18519729344 is 44392791581.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2951042 + ... + 2957310.

Almost surely, 2^18519729344 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 18519729344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18983553600).

18519729344 is an abundant number, since it is smaller than the sum of its proper divisors (19447377856).

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

18519729344 is a wasteful number, since it uses less digits than its factorization.

18519729344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7801 (or 7791 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 53.

The spelling of 18519729344 in words is "eighteen billion, five hundred nineteen million, seven hundred twenty-nine thousand, three hundred forty-four".