18368545920 has 128 divisors (see below), whose sum is σ = 58828524480. Its totient is φ = 4874956800.

The previous prime is 18368545859. The next prime is 18368545961. The reversal of 18368545920 is 2954586381.

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, 382450 + ... + 427790.

Almost surely, 2^18368545920 is an apocalyptic number.

18368545920 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 18368545920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29414262240).

18368545920 is an abundant number, since it is smaller than the sum of its proper divisors (40459978560).

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

18368545920 is a wasteful number, since it uses less digits than its factorization.

18368545920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45574 (or 45562 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 51.

The spelling of 18368545920 in words is "eighteen billion, three hundred sixty-eight million, five hundred forty-five thousand, nine hundred twenty".