12668666 has 4 divisors (see below), whose sum is σ = 19003002. Its totient is φ = 6334332.

The previous prime is 12668659. The next prime is 12668717. The reversal of 12668666 is 66686621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66686621 = 739 ⋅90239.

It can be written as a sum of positive squares in only one way, i.e., 7447441 + 5221225 = 2729^2 + 2285^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3167165 + ... + 3167168.

Almost surely, 2^12668666 is an apocalyptic number.

12668666 is a deficient number, since it is larger than the sum of its proper divisors (6334336).

12668666 is an equidigital number, since it uses as much as digits as its factorization.

12668666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6334335.

The product of its digits is 124416, while the sum is 41.

The square root of 12668666 is about 3559.3069550125. The cubic root of 12668666 is about 233.1186192601.

The spelling of 12668666 in words is "twelve million, six hundred sixty-eight thousand, six hundred sixty-six".