18011915550720 has 3648 divisors, whose sum is σ = 86755489551360. Its totient is φ = 3500666781696.

The previous prime is 18011915550709. The next prime is 18011915550721. The reversal of 18011915550720 is 2705551911081.

18011915550720 is a `hidden beast` number, since 1 + 8 + 0 + 1 + 1 + 91 + 5 + 550 + 7 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18011915550721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 383232245737 + ... + 383232245783.

It is an arithmetic number, because the mean of its divisors is an integer number (23781658320).

Almost surely, 2^{18011915550720} is an apocalyptic number.

18011915550720 is a gapful number since it is divisible by the number (10) 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 18011915550720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43377744775680).

18011915550720 is an abundant number, since it is smaller than the sum of its proper divisors (68743574000640).

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

18011915550720 is an equidigital number, since it uses as much as digits as its factorization.

18011915550720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 45.

The spelling of 18011915550720 in words is "eighteen trillion, eleven billion, nine hundred fifteen million, five hundred fifty thousand, seven hundred twenty".