12665641 has 2 divisors, whose sum is σ = 12665642. Its totient is φ = 12665640.

The previous prime is 12665593. The next prime is 12665651. The reversal of 12665641 is 14656621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7952400 + 4713241 = 2820^2 + 2171^2 .

It is a cyclic number.

It is not a de Polignac number, because 12665641 - 2¹⁷ = 12534569 is a prime.

It is not a weakly prime, because it can be changed into another prime (12665651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6332820 + 6332821.

It is an arithmetic number, because the mean of its divisors is an integer number (6332821).

Almost surely, 2^12665641 is an apocalyptic number.

It is an amenable number.

12665641 is a deficient number, since it is larger than the sum of its proper divisors (1).

12665641 is an equidigital number, since it uses as much as digits as its factorization.

12665641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

The square root of 12665641 is about 3558.8819873663. The cubic root of 12665641 is about 233.1000632427.

The spelling of 12665641 in words is "twelve million, six hundred sixty-five thousand, six hundred forty-one".