12908185617 has 4 divisors (see below), whose sum is σ = 17210914160. Its totient is φ = 8605457076.

The previous prime is 12908185547. The next prime is 12908185627. The reversal of 12908185617 is 71658180921.

It is a happy number.

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 not a de Polignac number, because 12908185617 - 2¹⁵ = 12908152849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12908185627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2151364267 + ... + 2151364272.

It is an arithmetic number, because the mean of its divisors is an integer number (4302728540).

Almost surely, 2^12908185617 is an apocalyptic number.

It is an amenable number.

12908185617 is a deficient number, since it is larger than the sum of its proper divisors (4302728543).

12908185617 is an equidigital number, since it uses as much as digits as its factorization.

12908185617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4302728542.

The product of its (nonzero) digits is 241920, while the sum is 48.

The spelling of 12908185617 in words is "twelve billion, nine hundred eight million, one hundred eighty-five thousand, six hundred seventeen".