12668641 has 2 divisors, whose sum is σ = 12668642. Its totient is φ = 12668640.

The previous prime is 12668627. The next prime is 12668659. The reversal of 12668641 is 14686621.

12668641 is nontrivially palindromic in base 15.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12278016 + 390625 = 3504^2 + 625^2 .

It is an emirp because it is prime and its reverse (14686621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12668641 - 2⁵ = 12668609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12668597 and 12668606.

It is not a weakly prime, because it can be changed into another prime (12668941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6334320 + 6334321.

It is an arithmetic number, because the mean of its divisors is an integer number (6334321).

Almost surely, 2^12668641 is an apocalyptic number.

It is an amenable number.

12668641 is a deficient number, since it is larger than the sum of its proper divisors (1).

12668641 is an equidigital number, since it uses as much as digits as its factorization.

12668641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 34.

The square root of 12668641 is about 3559.3034430911. The cubic root of 12668641 is about 233.1184659167.

The spelling of 12668641 in words is "twelve million, six hundred sixty-eight thousand, six hundred forty-one".