12666671 has 2 divisors, whose sum is σ = 12666672. Its totient is φ = 12666670.

The previous prime is 12666607. The next prime is 12666679. The reversal of 12666671 is 17666621.

12666671 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12666671 - 2⁶ = 12666607 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12666679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6333335 + 6333336.

It is an arithmetic number, because the mean of its divisors is an integer number (6333336).

Almost surely, 2^12666671 is an apocalyptic number.

12666671 is a deficient number, since it is larger than the sum of its proper divisors (1).

12666671 is an equidigital number, since it uses as much as digits as its factorization.

12666671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 12666671 is about 3559.0266927912. The cubic root of 12666671 is about 233.1063818217.

The spelling of 12666671 in words is "twelve million, six hundred sixty-six thousand, six hundred seventy-one".