18855518716672 has 72 divisors (see below), whose sum is σ = 41073691663872. Its totient is φ = 8567615923200.

The previous prime is 18855518716667. The next prime is 18855518716673. The reversal of 18855518716672 is 27661781555881.

It is not an unprimeable number, because it can be changed into a prime (18855518716673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6659913 + ... + 9058999.

It is an arithmetic number, because the mean of its divisors is an integer number (570467939776).

Almost surely, 2^{18855518716672} 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 18855518716672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20536845831936).

18855518716672 is an abundant number, since it is smaller than the sum of its proper divisors (22218172947200).

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

18855518716672 is a wasteful number, since it uses less digits than its factorization.

18855518716672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2401905 (or 2401891 counting only the distinct ones).

The product of its digits is 225792000, while the sum is 70.

The spelling of 18855518716672 in words is "eighteen trillion, eight hundred fifty-five billion, five hundred eighteen million, seven hundred sixteen thousand, six hundred seventy-two".