12664505 has 8 divisors (see below), whose sum is σ = 17368512. Its totient is φ = 8684208.

The previous prime is 12664501. The next prime is 12664511. The reversal of 12664505 is 50546621.

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

It is a cyclic number.

It is not a de Polignac number, because 12664505 - 2² = 12664501 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12664501) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 180887 + ... + 180956.

It is an arithmetic number, because the mean of its divisors is an integer number (2171064).

Almost surely, 2^12664505 is an apocalyptic number.

It is an amenable number.

12664505 is a deficient number, since it is larger than the sum of its proper divisors (4704007).

12664505 is an equidigital number, since it uses as much as digits as its factorization.

12664505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361855.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 12664505 is about 3558.7223831032. The cubic root of 12664505 is about 233.0930940050.

The spelling of 12664505 in words is "twelve million, six hundred sixty-four thousand, five hundred five".