12105665 has 16 divisors (see below), whose sum is σ = 17067456. Its totient is φ = 8126400.

The previous prime is 12105647. The next prime is 12105733. The reversal of 12105665 is 56650121.

It is not a de Polignac number, because 12105665 - 2⁶ = 12105601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7751 + ... + 9180.

It is an arithmetic number, because the mean of its divisors is an integer number (1066716).

Almost surely, 2^12105665 is an apocalyptic number.

It is an amenable number.

12105665 is a deficient number, since it is larger than the sum of its proper divisors (4961791).

12105665 is a wasteful number, since it uses less digits than its factorization.

12105665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16960.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 12105665 is about 3479.3196173965. The cubic root of 12105665 is about 229.6128648091.

Adding to 12105665 its reverse (56650121), we get a palindrome (68755786).

It can be divided in two parts, 121056 and 65, that added together give a palindrome (121121).

The spelling of 12105665 in words is "twelve million, one hundred five thousand, six hundred sixty-five".