12666851 has 2 divisors, whose sum is σ = 12666852. Its totient is φ = 12666850.

The previous prime is 12666847. The next prime is 12666877. The reversal of 12666851 is 15866621.

It is a happy number.

12666851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12666851 - 2² = 12666847 is a prime.

It is a super-2 number, since 2×12666851² = 320898228512402, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (12666821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6333425 + 6333426.

It is an arithmetic number, because the mean of its divisors is an integer number (6333426).

Almost surely, 2^12666851 is an apocalyptic number.

12666851 is a deficient number, since it is larger than the sum of its proper divisors (1).

12666851 is an equidigital number, since it uses as much as digits as its factorization.

12666851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 35.

The square root of 12666851 is about 3559.0519805139. The cubic root of 12666851 is about 233.1074860042.

The spelling of 12666851 in words is "twelve million, six hundred sixty-six thousand, eight hundred fifty-one".