12666985 has 4 divisors (see below), whose sum is σ = 15200388. Its totient is φ = 10133584.

The previous prime is 12666967. The next prime is 12667001. The reversal of 12666985 is 58966621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58966621 = 7 ⋅8423803.

It can be written as a sum of positive squares in 2 ways, for example, as 9834496 + 2832489 = 3136^2 + 1683^2 .

It is a cyclic number.

It is not a de Polignac number, because 12666985 - 2²³ = 4278377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1266694 + ... + 1266703.

It is an arithmetic number, because the mean of its divisors is an integer number (3800097).

Almost surely, 2^12666985 is an apocalyptic number.

It is an amenable number.

12666985 is a deficient number, since it is larger than the sum of its proper divisors (2533403).

12666985 is an equidigital number, since it uses as much as digits as its factorization.

12666985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2533402.

The product of its digits is 155520, while the sum is 43.

The square root of 12666985 is about 3559.0708057020. The cubic root of 12666985 is about 233.1083079999.

The spelling of 12666985 in words is "twelve million, six hundred sixty-six thousand, nine hundred eighty-five".