18338533520 has 20 divisors (see below), whose sum is σ = 42637090620. Its totient is φ = 7335413376.

The previous prime is 18338533519. The next prime is 18338533523. The reversal of 18338533520 is 2533583381.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9042488464 + 9296045056 = 95092^2 + 96416^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (18338533523) 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 3 ways as a sum of consecutive naturals, for example, 114615755 + ... + 114615914.

It is an arithmetic number, because the mean of its divisors is an integer number (2131854531).

Almost surely, 2^18338533520 is an apocalyptic number.

18338533520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18338533520 is an abundant number, since it is smaller than the sum of its proper divisors (24298557100).

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

18338533520 is a wasteful number, since it uses less digits than its factorization.

18338533520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229231682 (or 229231676 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 18338533520 in words is "eighteen billion, three hundred thirty-eight million, five hundred thirty-three thousand, five hundred twenty".