12666143 has 4 divisors (see below), whose sum is σ = 14475600. Its totient is φ = 10856688.

The previous prime is 12666133. The next prime is 12666167. The reversal of 12666143 is 34166621.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 12666143 - 2⁶ = 12666079 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 (12666133) 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 in 3 ways as a sum of consecutive naturals, for example, 904718 + ... + 904731.

It is an arithmetic number, because the mean of its divisors is an integer number (3618900).

Almost surely, 2^12666143 is an apocalyptic number.

12666143 is a deficient number, since it is larger than the sum of its proper divisors (1809457).

12666143 is an equidigital number, since it uses as much as digits as its factorization.

12666143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1809456.

The product of its digits is 5184, while the sum is 29.

The square root of 12666143 is about 3558.9525144345. The cubic root of 12666143 is about 233.1031428259.

The spelling of 12666143 in words is "twelve million, six hundred sixty-six thousand, one hundred forty-three".