18231423218 has 8 divisors (see below), whose sum is σ = 27353376000. Its totient is φ = 9113631220.

The previous prime is 18231423193. The next prime is 18231423283. The reversal of 18231423218 is 81232413281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1029218 + ... + 1046781.

It is an arithmetic number, because the mean of its divisors is an integer number (3419172000).

Almost surely, 2^18231423218 is an apocalyptic number.

18231423218 is a deficient number, since it is larger than the sum of its proper divisors (9121952782).

18231423218 is a wasteful number, since it uses less digits than its factorization.

18231423218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2080392.

The product of its digits is 18432, while the sum is 35.

Adding to 18231423218 its reverse (81232413281), we get a palindrome (99463836499).

The spelling of 18231423218 in words is "eighteen billion, two hundred thirty-one million, four hundred twenty-three thousand, two hundred eighteen".