18399999744 has 144 divisors (see below), whose sum is σ = 62185347840. Its totient is φ = 5257128960.

The previous prime is 18399999689. The next prime is 18399999757. The reversal of 18399999744 is 44799999381.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141762 + ... + 238529.

Almost surely, 2^18399999744 is an apocalyptic number.

18399999744 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18399999744 is an abundant number, since it is smaller than the sum of its proper divisors (43785348096).

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

18399999744 is an equidigital number, since it uses as much as digits as its factorization.

18399999744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380323 (or 380303 counting only the distinct ones).

The product of its digits is 158723712, while the sum is 72.

18399999744 divided by its sum of digits (72) gives a palindrome (255555552).

The spelling of 18399999744 in words is "eighteen billion, three hundred ninety-nine million, nine hundred ninety-nine thousand, seven hundred forty-four".