12605564717 has 4 divisors (see below), whose sum is σ = 12607828956. Its totient is φ = 12603300480.

The previous prime is 12605564693. The next prime is 12605564749. The reversal of 12605564717 is 71746550621.

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 4615707721 + 7989856996 = 67939^2 + 89386^2 .

It is a cyclic number.

It is not a de Polignac number, because 12605564717 - 2¹⁸ = 12605302573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12605560717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1123748 + ... + 1134909.

It is an arithmetic number, because the mean of its divisors is an integer number (3151957239).

Almost surely, 2^12605564717 is an apocalyptic number.

It is an amenable number.

12605564717 is a deficient number, since it is larger than the sum of its proper divisors (2264239).

12605564717 is an equidigital number, since it uses as much as digits as its factorization.

12605564717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2264238.

The product of its (nonzero) digits is 352800, while the sum is 44.

The spelling of 12605564717 in words is "twelve billion, six hundred five million, five hundred sixty-four thousand, seven hundred seventeen".