12665687 has 2 divisors, whose sum is σ = 12665688. Its totient is φ = 12665686.

The previous prime is 12665677. The next prime is 12665689. The reversal of 12665687 is 78656621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12665687 - 2⁴ = 12665671 is a prime.

Together with 12665689, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12665689) 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 as a sum of consecutive naturals, namely, 6332843 + 6332844.

It is an arithmetic number, because the mean of its divisors is an integer number (6332844).

Almost surely, 2^12665687 is an apocalyptic number.

12665687 is a deficient number, since it is larger than the sum of its proper divisors (1).

12665687 is an equidigital number, since it uses as much as digits as its factorization.

12665687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 41.

The square root of 12665687 is about 3558.8884500641. Note that the first 3 decimals coincide. The cubic root of 12665687 is about 233.1003454390.

The spelling of 12665687 in words is "twelve million, six hundred sixty-five thousand, six hundred eighty-seven".