18233249920 has 32 divisors (see below), whose sum is σ = 43588864620. Its totient is φ = 7293299712.

The previous prime is 18233249917. The next prime is 18233249929. The reversal of 18233249920 is 2994233281.

It can be written as a sum of positive squares in 2 ways, for example, as 15211768896 + 3021481024 = 123336^2 + 54968^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (18233249929) 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, 14244087 + ... + 14245366.

Almost surely, 2^18233249920 is an apocalyptic number.

18233249920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18233249920 is an abundant number, since it is smaller than the sum of its proper divisors (25355614700).

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

18233249920 is an equidigital number, since it uses as much as digits as its factorization.

18233249920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28489472 (or 28489460 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 43.

The spelling of 18233249920 in words is "eighteen billion, two hundred thirty-three million, two hundred forty-nine thousand, nine hundred twenty".