12966566 has 4 divisors (see below), whose sum is σ = 19449852. Its totient is φ = 6483282.

The previous prime is 12966559. The next prime is 12966589. The reversal of 12966566 is 66566921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66566921 = 61 ⋅1091261.

It is a congruent number.

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, 3241640 + ... + 3241643.

It is an arithmetic number, because the mean of its divisors is an integer number (4862463).

Almost surely, 2^12966566 is an apocalyptic number.

12966566 is a deficient number, since it is larger than the sum of its proper divisors (6483286).

12966566 is an equidigital number, since it uses as much as digits as its factorization.

12966566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6483285.

The product of its digits is 116640, while the sum is 41.

The square root of 12966566 is about 3600.9118289678. The cubic root of 12966566 is about 234.9317200151.

The spelling of 12966566 in words is "twelve million, nine hundred sixty-six thousand, five hundred sixty-six".