12665611 has 4 divisors (see below), whose sum is σ = 14474992. Its totient is φ = 10856232.

The previous prime is 12665593. The next prime is 12665641. The reversal of 12665611 is 11656621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11656621 = 193 ⋅60397.

It is a cyclic number.

It is not a de Polignac number, because 12665611 - 2¹³ = 12657419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12665611.

It is not an unprimeable number, because it can be changed into a prime (12665641) 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, 904680 + ... + 904693.

It is an arithmetic number, because the mean of its divisors is an integer number (3618748).

Almost surely, 2^12665611 is an apocalyptic number.

12665611 is a deficient number, since it is larger than the sum of its proper divisors (1809381).

12665611 is an equidigital number, since it uses as much as digits as its factorization.

12665611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1809380.

The product of its digits is 2160, while the sum is 28.

The square root of 12665611 is about 3558.8777725570. The cubic root of 12665611 is about 233.0998792013.

The spelling of 12665611 in words is "twelve million, six hundred sixty-five thousand, six hundred eleven".