18516242228233 has 4 divisors (see below), whose sum is σ = 18517056115968. Its totient is φ = 18515428340500.

The previous prime is 18516242228207. The next prime is 18516242228303. The reversal of 18516242228233 is 33282224261581.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18516242228233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18516242928233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406909741 + ... + 406955242.

It is an arithmetic number, because the mean of its divisors is an integer number (4629264028992).

Almost surely, 2^{18516242228233} is an apocalyptic number.

It is an amenable number.

18516242228233 is a deficient number, since it is larger than the sum of its proper divisors (813887735).

18516242228233 is an equidigital number, since it uses as much as digits as its factorization.

18516242228233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813887734.

The product of its digits is 2211840, while the sum is 49.

The spelling of 18516242228233 in words is "eighteen trillion, five hundred sixteen billion, two hundred forty-two million, two hundred twenty-eight thousand, two hundred thirty-three".