18258857232 has 160 divisors (see below), whose sum is σ = 58910991360. Its totient is φ = 4734236160.

The previous prime is 18258857203. The next prime is 18258857249. The reversal of 18258857232 is 23275885281.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2261619 + ... + 2269677.

It is an arithmetic number, because the mean of its divisors is an integer number (368193696).

Almost surely, 2^18258857232 is an apocalyptic number.

18258857232 is a gapful number since it is divisible by the number (12) 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 18258857232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29455495680).

18258857232 is an abundant number, since it is smaller than the sum of its proper divisors (40652134128).

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

18258857232 is a wasteful number, since it uses less digits than its factorization.

18258857232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8701 (or 8695 counting only the distinct ones).

The product of its digits is 2150400, while the sum is 51.

The spelling of 18258857232 in words is "eighteen billion, two hundred fifty-eight million, eight hundred fifty-seven thousand, two hundred thirty-two".