12663817 has 2 divisors, whose sum is σ = 12663818. Its totient is φ = 12663816.

The previous prime is 12663809. The next prime is 12663829. The reversal of 12663817 is 71836621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9114361 + 3549456 = 3019^2 + 1884^2 .

It is an emirp because it is prime and its reverse (71836621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12663817 - 2³ = 12663809 is a prime.

It is a super-2 number, since 2×12663817² = 320744522018978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12663877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6331908 + 6331909.

It is an arithmetic number, because the mean of its divisors is an integer number (6331909).

Almost surely, 2^12663817 is an apocalyptic number.

It is an amenable number.

12663817 is a deficient number, since it is larger than the sum of its proper divisors (1).

12663817 is an equidigital number, since it uses as much as digits as its factorization.

12663817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The square root of 12663817 is about 3558.6257178860. The cubic root of 12663817 is about 233.0888729964.

The spelling of 12663817 in words is "twelve million, six hundred sixty-three thousand, eight hundred seventeen".