12666607 has 2 divisors, whose sum is σ = 12666608. Its totient is φ = 12666606.

The previous prime is 12666601. The next prime is 12666671. The reversal of 12666607 is 70666621.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12666607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12666601) 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 as a sum of consecutive naturals, namely, 6333303 + 6333304.

It is an arithmetic number, because the mean of its divisors is an integer number (6333304).

Almost surely, 2^12666607 is an apocalyptic number.

12666607 is a deficient number, since it is larger than the sum of its proper divisors (1).

12666607 is an equidigital number, since it uses as much as digits as its factorization.

12666607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 12666607 is about 3559.0177015576. The cubic root of 12666607 is about 233.1059892209.

The spelling of 12666607 in words is "twelve million, six hundred sixty-six thousand, six hundred seven".