12605564161 has 8 divisors (see below), whose sum is σ = 13312111680. Its totient is φ = 11912223312.

The previous prime is 12605564159. The next prime is 12605564221. The reversal of 12605564161 is 16146550621.

12605564161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 12605564161 - 2¹ = 12605564159 is a prime.

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 12605564161.

It is not an unprimeable number, because it can be changed into a prime (12605594161) 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 7 ways as a sum of consecutive naturals, for example, 3299706 + ... + 3303523.

It is an arithmetic number, because the mean of its divisors is an integer number (1664013960).

Almost surely, 2^12605564161 is an apocalyptic number.

It is an amenable number.

12605564161 is a deficient number, since it is larger than the sum of its proper divisors (706547519).

12605564161 is an equidigital number, since it uses as much as digits as its factorization.

12605564161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6603335.

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 12605564161 in words is "twelve billion, six hundred five million, five hundred sixty-four thousand, one hundred sixty-one".