12261312617 has 4 divisors (see below), whose sum is σ = 12906644880. Its totient is φ = 11615980356.

The previous prime is 12261312589. The next prime is 12261312643. The reversal of 12261312617 is 71621316221.

12261312617 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, 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 12261312617 - 2⁸ = 12261312361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12261312667) 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, 322666103 + ... + 322666140.

It is an arithmetic number, because the mean of its divisors is an integer number (3226661220).

Almost surely, 2^12261312617 is an apocalyptic number.

It is an amenable number.

12261312617 is a deficient number, since it is larger than the sum of its proper divisors (645332263).

12261312617 is an equidigital number, since it uses as much as digits as its factorization.

12261312617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645332262.

The product of its digits is 6048, while the sum is 32.

Adding to 12261312617 its reverse (71621316221), we get a palindrome (83882628838).

The spelling of 12261312617 in words is "twelve billion, two hundred sixty-one million, three hundred twelve thousand, six hundred seventeen".