12665317 has 4 divisors (see below), whose sum is σ = 14474656. Its totient is φ = 10855980.

The previous prime is 12665311. The next prime is 12665363. The reversal of 12665317 is 71356621.

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, and also an emirpimes, since its reverse is a distinct semiprime: 71356621 = 7 ⋅10193803.

It is a cyclic number.

It is not a de Polignac number, because 12665317 - 2³ = 12665309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12665311) 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, 904659 + ... + 904672.

It is an arithmetic number, because the mean of its divisors is an integer number (3618664).

Almost surely, 2^12665317 is an apocalyptic number.

It is an amenable number.

12665317 is a deficient number, since it is larger than the sum of its proper divisors (1809339).

12665317 is an equidigital number, since it uses as much as digits as its factorization.

12665317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1809338.

The product of its digits is 7560, while the sum is 31.

The square root of 12665317 is about 3558.8364671617. The cubic root of 12665317 is about 233.0980755801.

The spelling of 12665317 in words is "twelve million, six hundred sixty-five thousand, three hundred seventeen".