12366661 has 4 divisors (see below), whose sum is σ = 12379500. Its totient is φ = 12353824.

The previous prime is 12366643. The next prime is 12366703. The reversal of 12366661 is 16666321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5317636 + 7049025 = 2306^2 + 2655^2 .

It is a cyclic number.

It is not a de Polignac number, because 12366661 - 2⁷ = 12366533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12366631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4846 + ... + 6943.

It is an arithmetic number, because the mean of its divisors is an integer number (3094875).

Almost surely, 2^12366661 is an apocalyptic number.

It is an amenable number.

12366661 is a deficient number, since it is larger than the sum of its proper divisors (12839).

12366661 is a wasteful number, since it uses less digits than its factorization.

12366661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12838.

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

The square root of 12366661 is about 3516.6263662778. The cubic root of 12366661 is about 231.2512835575.

The spelling of 12366661 in words is "twelve million, three hundred sixty-six thousand, six hundred sixty-one".