18559561168872 has 96 divisors (see below), whose sum is σ = 52928613972000. Its totient is φ = 5858966252160.

The previous prime is 18559561168831. The next prime is 18559561168901. The reversal of 18559561168872 is 27886116595581.

18559561168872 is a `hidden beast` number, since 1 + 8 + 5 + 59 + 561 + 1 + 6 + 8 + 8 + 7 + 2 = 666.

It is a super-2 number, since 2×18559561168872² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 18559561168872.

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, 1866154 + ... + 6371942.

It is an arithmetic number, because the mean of its divisors is an integer number (551339728875).

Almost surely, 2^{18559561168872} is an apocalyptic number.

18559561168872 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 18559561168872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26464306986000).

18559561168872 is an abundant number, since it is smaller than the sum of its proper divisors (34369052803128).

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

18559561168872 is a wasteful number, since it uses less digits than its factorization.

18559561168872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4508831 (or 4508824 counting only the distinct ones).

The product of its digits is 290304000, while the sum is 72.

The spelling of 18559561168872 in words is "eighteen trillion, five hundred fifty-nine billion, five hundred sixty-one million, one hundred sixty-eight thousand, eight hundred seventy-two".