18336208512 has 128 divisors (see below), whose sum is σ = 49943900160. Its totient is φ = 5957737472.

The previous prime is 18336208489. The next prime is 18336208577. The reversal of 18336208512 is 21580263381.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4744693 + ... + 4748555.

It is an arithmetic number, because the mean of its divisors is an integer number (390186720).

Almost surely, 2^18336208512 is an apocalyptic number.

18336208512 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 18336208512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24971950080).

18336208512 is an abundant number, since it is smaller than the sum of its proper divisors (31607691648).

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

18336208512 is a wasteful number, since it uses less digits than its factorization.

18336208512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4190 (or 4178 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The spelling of 18336208512 in words is "eighteen billion, three hundred thirty-six million, two hundred eight thousand, five hundred twelve".