12564665 has 8 divisors (see below), whose sum is σ = 15110280. Its totient is φ = 10029952.

The previous prime is 12564637. The next prime is 12564667. The reversal of 12564665 is 56646521.

It can be written as a sum of positive squares in 4 ways, for example, as 2458624 + 10106041 = 1568^2 + 3179^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12564665 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12564667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77 + ... + 5013.

It is an arithmetic number, because the mean of its divisors is an integer number (1888785).

Almost surely, 2^12564665 is an apocalyptic number.

It is an amenable number.

12564665 is a deficient number, since it is larger than the sum of its proper divisors (2545615).

12564665 is an equidigital number, since it uses as much as digits as its factorization.

12564665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5451.

The product of its digits is 43200, while the sum is 35.

The square root of 12564665 is about 3544.6671211836. The cubic root of 12564665 is about 232.4789513453.

The spelling of 12564665 in words is "twelve million, five hundred sixty-four thousand, six hundred sixty-five".