12456321649 has 4 divisors (see below), whose sum is σ = 12463612020. Its totient is φ = 12449031280.

The previous prime is 12456321641. The next prime is 12456321659. The reversal of 12456321649 is 94612365421.

12456321649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5134439025 + 7321882624 = 71655^2 + 85568^2 .

It is a cyclic number.

It is not a de Polignac number, because 12456321649 - 2³ = 12456321641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12456321641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3642622 + ... + 3646039.

It is an arithmetic number, because the mean of its divisors is an integer number (3115903005).

Almost surely, 2^12456321649 is an apocalyptic number.

It is an amenable number.

12456321649 is a deficient number, since it is larger than the sum of its proper divisors (7290371).

12456321649 is an equidigital number, since it uses as much as digits as its factorization.

12456321649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7290370.

The product of its digits is 311040, while the sum is 43.

The spelling of 12456321649 in words is "twelve billion, four hundred fifty-six million, three hundred twenty-one thousand, six hundred forty-nine".