18230733809 has 4 divisors (see below), whose sum is σ = 18232809840. Its totient is φ = 18228657780.

The previous prime is 18230733803. The next prime is 18230733839. The reversal of 18230733809 is 90833703281.

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: 90833703281 = 23 ⋅3949291447.

It is a cyclic number.

It is not a de Polignac number, because 18230733809 - 2⁴ = 18230733793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18230733809.

It is not an unprimeable number, because it can be changed into a prime (18230733803) 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, 1024787 + ... + 1042424.

It is an arithmetic number, because the mean of its divisors is an integer number (4558202460).

Almost surely, 2^18230733809 is an apocalyptic number.

It is an amenable number.

18230733809 is a deficient number, since it is larger than the sum of its proper divisors (2076031).

18230733809 is an equidigital number, since it uses as much as digits as its factorization.

18230733809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2076030.

The product of its (nonzero) digits is 217728, while the sum is 44.

The spelling of 18230733809 in words is "eighteen billion, two hundred thirty million, seven hundred thirty-three thousand, eight hundred nine".