12666665 has 8 divisors (see below), whose sum is σ = 16581888. Its totient is φ = 9212080.

The previous prime is 12666607. The next prime is 12666671. The reversal of 12666665 is 56666621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12666665 - 2⁶ = 12666601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115097 + ... + 115206.

It is an arithmetic number, because the mean of its divisors is an integer number (2072736).

Almost surely, 2^12666665 is an apocalyptic number.

It is an amenable number.

12666665 is a deficient number, since it is larger than the sum of its proper divisors (3915223).

12666665 is a wasteful number, since it uses less digits than its factorization.

12666665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230319.

The product of its digits is 77760, while the sum is 38.

The square root of 12666665 is about 3559.0258498640. The cubic root of 12666665 is about 233.1063450154.

It can be divided in two parts, 12666 and 665, that added together give a palindrome (13331).

The spelling of 12666665 in words is "twelve million, six hundred sixty-six thousand, six hundred sixty-five".