12666361 has 2 divisors, whose sum is σ = 12666362. Its totient is φ = 12666360.

The previous prime is 12666347. The next prime is 12666371. The reversal of 12666361 is 16366621.

12666361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9960336 + 2706025 = 3156^2 + 1645^2 .

It is an emirp because it is prime and its reverse (16366621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12666361 is a prime.

It is not a weakly prime, because it can be changed into another prime (12666371) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6333180 + 6333181.

It is an arithmetic number, because the mean of its divisors is an integer number (6333181).

Almost surely, 2^12666361 is an apocalyptic number.

It is an amenable number.

12666361 is a deficient number, since it is larger than the sum of its proper divisors (1).

12666361 is an equidigital number, since it uses as much as digits as its factorization.

12666361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 31.

The square root of 12666361 is about 3558.9831412919. The cubic root of 12666361 is about 233.1044801495.

The spelling of 12666361 in words is "twelve million, six hundred sixty-six thousand, three hundred sixty-one".