12666385 has 4 divisors (see below), whose sum is σ = 15199668. Its totient is φ = 10133104.

The previous prime is 12666371. The next prime is 12666389. The reversal of 12666385 is 58366621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6436369 + 6230016 = 2537^2 + 2496^2 .

It is a cyclic number.

It is not a de Polignac number, because 12666385 - 2¹³ = 12658193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12666389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1266634 + ... + 1266643.

It is an arithmetic number, because the mean of its divisors is an integer number (3799917).

Almost surely, 2^12666385 is an apocalyptic number.

It is an amenable number.

12666385 is a deficient number, since it is larger than the sum of its proper divisors (2533283).

12666385 is an equidigital number, since it uses as much as digits as its factorization.

12666385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2533282.

The product of its digits is 51840, while the sum is 37.

The square root of 12666385 is about 3558.9865130399. The cubic root of 12666385 is about 233.1046273768.

The spelling of 12666385 in words is "twelve million, six hundred sixty-six thousand, three hundred eighty-five".