18424703809 has 4 divisors (see below), whose sum is σ = 18431951616. Its totient is φ = 18417456004.

The previous prime is 18424703797. The next prime is 18424703831. The reversal of 18424703809 is 90830742481.

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 not a de Polignac number, because 18424703809 - 2¹¹ = 18424701761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18424703849) 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, 3620089 + ... + 3625174.

It is an arithmetic number, because the mean of its divisors is an integer number (4607987904).

Almost surely, 2^18424703809 is an apocalyptic number.

It is an amenable number.

18424703809 is a deficient number, since it is larger than the sum of its proper divisors (7247807).

18424703809 is an equidigital number, since it uses as much as digits as its factorization.

18424703809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7247806.

The product of its (nonzero) digits is 387072, while the sum is 46.

The spelling of 18424703809 in words is "eighteen billion, four hundred twenty-four million, seven hundred three thousand, eight hundred nine".