12389644505 has 8 divisors (see below), whose sum is σ = 16991512512. Its totient is φ = 8495756208.

The previous prime is 12389644493. The next prime is 12389644537. The reversal of 12389644505 is 50544698321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12389644505 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 12389644505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176994887 + ... + 176994956.

It is an arithmetic number, because the mean of its divisors is an integer number (2123939064).

Almost surely, 2^12389644505 is an apocalyptic number.

It is an amenable number.

12389644505 is a deficient number, since it is larger than the sum of its proper divisors (4601868007).

12389644505 is an equidigital number, since it uses as much as digits as its factorization.

12389644505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353989855.

The product of its (nonzero) digits is 1036800, while the sum is 47.

The spelling of 12389644505 in words is "twelve billion, three hundred eighty-nine million, six hundred forty-four thousand, five hundred five".