18516231552 has 256 divisors, whose sum is σ = 62490193920. Its totient is φ = 4725596160.

The previous prime is 18516231529. The next prime is 18516231577. The reversal of 18516231552 is 25513261581.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 18516231552.

It is a congruent 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, 1074718 + ... + 1091810.

It is an arithmetic number, because the mean of its divisors is an integer number (244102320).

Almost surely, 2^18516231552 is an apocalyptic number.

18516231552 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 18516231552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31245096960).

18516231552 is an abundant number, since it is smaller than the sum of its proper divisors (43973962368).

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

18516231552 is a wasteful number, since it uses less digits than its factorization.

18516231552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17161 (or 17149 counting only the distinct ones).

The product of its digits is 72000, while the sum is 39.

The spelling of 18516231552 in words is "eighteen billion, five hundred sixteen million, two hundred thirty-one thousand, five hundred fifty-two".