12666601 has 2 divisors, whose sum is σ = 12666602. Its totient is φ = 12666600.

The previous prime is 12666593. The next prime is 12666607. The reversal of 12666601 is 10666621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12257001 + 409600 = 3501^2 + 640^2 .

It is a cyclic number.

It is not a de Polignac number, because 12666601 - 2³ = 12666593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12666601.

It is not a weakly prime, because it can be changed into another prime (12666607) 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, 6333300 + 6333301.

It is an arithmetic number, because the mean of its divisors is an integer number (6333301).

Almost surely, 2^12666601 is an apocalyptic number.

It is an amenable number.

12666601 is a deficient number, since it is larger than the sum of its proper divisors (1).

12666601 is an equidigital number, since it uses as much as digits as its factorization.

12666601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 12666601 is about 3559.0168586282. The cubic root of 12666601 is about 233.1059524145.

The spelling of 12666601 in words is "twelve million, six hundred sixty-six thousand, six hundred one".