12423645989 has 4 divisors (see below), whose sum is σ = 12634216320. Its totient is φ = 12213075660.

The previous prime is 12423645979. The next prime is 12423646007. The reversal of 12423645989 is 98954632421.

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 12423645989 - 2⁴ = 12423645973 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12423645989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12423645929) 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, 105285077 + ... + 105285194.

It is an arithmetic number, because the mean of its divisors is an integer number (3158554080).

Almost surely, 2^12423645989 is an apocalyptic number.

It is an amenable number.

12423645989 is a deficient number, since it is larger than the sum of its proper divisors (210570331).

12423645989 is an equidigital number, since it uses as much as digits as its factorization.

12423645989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210570330.

The product of its digits is 3732480, while the sum is 53.

The spelling of 12423645989 in words is "twelve billion, four hundred twenty-three million, six hundred forty-five thousand, nine hundred eighty-nine".