12566332617 has 4 divisors (see below), whose sum is σ = 16755110160. Its totient is φ = 8377555076.

The previous prime is 12566332589. The next prime is 12566332621. The reversal of 12566332617 is 71623366521.

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 12566332617 - 2¹⁴ = 12566316233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12566332657) 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, 2094388767 + ... + 2094388772.

It is an arithmetic number, because the mean of its divisors is an integer number (4188777540).

Almost surely, 2^12566332617 is an apocalyptic number.

It is an amenable number.

12566332617 is a deficient number, since it is larger than the sum of its proper divisors (4188777543).

12566332617 is an equidigital number, since it uses as much as digits as its factorization.

12566332617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4188777542.

The product of its digits is 272160, while the sum is 42.

The spelling of 12566332617 in words is "twelve billion, five hundred sixty-six million, three hundred thirty-two thousand, six hundred seventeen".