18411612689 has 4 divisors (see below), whose sum is σ = 18414778224. Its totient is φ = 18408447156.

The previous prime is 18411612623. The next prime is 18411612691. The reversal of 18411612689 is 98621611481.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98621611481 = 569 ⋅173324449.

It is a cyclic number.

It is not a de Polignac number, because 18411612689 - 2⁸ = 18411612433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18411012689) 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, 1574027 + ... + 1585680.

It is an arithmetic number, because the mean of its divisors is an integer number (4603694556).

Almost surely, 2^18411612689 is an apocalyptic number.

It is an amenable number.

18411612689 is a deficient number, since it is larger than the sum of its proper divisors (3165535).

18411612689 is an equidigital number, since it uses as much as digits as its factorization.

18411612689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3165534.

The product of its digits is 165888, while the sum is 47.

The spelling of 18411612689 in words is "eighteen billion, four hundred eleven million, six hundred twelve thousand, six hundred eighty-nine".