18318259552 has 48 divisors (see below), whose sum is σ = 37116001440. Its totient is φ = 8893006848.

The previous prime is 18318259529. The next prime is 18318259571. The reversal of 18318259552 is 25595281381.

It is a junction number, because it is equal to n+sod(n) for n = 18318259496 and 18318259505.

It is a congruent number.

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, 560724 + ... + 592492.

It is an arithmetic number, because the mean of its divisors is an integer number (773250030).

Almost surely, 2^18318259552 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 18318259552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18558000720).

18318259552 is an abundant number, since it is smaller than the sum of its proper divisors (18797741888).

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

18318259552 is a wasteful number, since it uses less digits than its factorization.

18318259552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32303 (or 32295 counting only the distinct ones).

The product of its digits is 864000, while the sum is 49.

The spelling of 18318259552 in words is "eighteen billion, three hundred eighteen million, two hundred fifty-nine thousand, five hundred fifty-two".