12609956449 has 4 divisors (see below), whose sum is σ = 12619816960. Its totient is φ = 12600095940.

The previous prime is 12609956419. The next prime is 12609956467. The reversal of 12609956449 is 94465990621.

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 12609956449 - 2⁹ = 12609955937 is a prime.

It is a super-2 number, since 2×12609956449² (a number of 21 digits) contains 22 as substring.

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 12609956449.

It is not an unprimeable number, because it can be changed into a prime (12609956419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4928337 + ... + 4930894.

It is an arithmetic number, because the mean of its divisors is an integer number (3154954240).

Almost surely, 2^12609956449 is an apocalyptic number.

It is an amenable number.

12609956449 is a deficient number, since it is larger than the sum of its proper divisors (9860511).

12609956449 is an equidigital number, since it uses as much as digits as its factorization.

12609956449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9860510.

The product of its (nonzero) digits is 4199040, while the sum is 55.

The spelling of 12609956449 in words is "twelve billion, six hundred nine million, nine hundred fifty-six thousand, four hundred forty-nine".