18231355324 has 72 divisors (see below), whose sum is σ = 40048089648. Its totient is φ = 7198087680.

The previous prime is 18231355309. The next prime is 18231355459. The reversal of 18231355324 is 42355313281.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1325764 + ... + 1339444.

Almost surely, 2^18231355324 is an apocalyptic number.

18231355324 is a gapful number since it is divisible by the number (14) 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 18231355324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20024044824).

18231355324 is an abundant number, since it is smaller than the sum of its proper divisors (21816734324).

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

18231355324 is a wasteful number, since it uses less digits than its factorization.

18231355324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14235 (or 14226 counting only the distinct ones).

The product of its digits is 86400, while the sum is 37.

The spelling of 18231355324 in words is "eighteen billion, two hundred thirty-one million, three hundred fifty-five thousand, three hundred twenty-four".