18431212799 has 4 divisors (see below), whose sum is σ = 18460422960. Its totient is φ = 18402002640.

The previous prime is 18431212777. The next prime is 18431212801. The reversal of 18431212799 is 99721213481.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18431212799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18431212399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14604134 + ... + 14605395.

It is an arithmetic number, because the mean of its divisors is an integer number (4615105740).

Almost surely, 2^18431212799 is an apocalyptic number.

18431212799 is a deficient number, since it is larger than the sum of its proper divisors (29210161).

18431212799 is an equidigital number, since it uses as much as digits as its factorization.

18431212799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29210160.

The product of its digits is 217728, while the sum is 47.

The spelling of 18431212799 in words is "eighteen billion, four hundred thirty-one million, two hundred twelve thousand, seven hundred ninety-nine".