12665809753 has 4 divisors (see below), whose sum is σ = 12666038580. Its totient is φ = 12665580928.

The previous prime is 12665809747. The next prime is 12665809787. The reversal of 12665809753 is 35790856621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11242785024 + 1423024729 = 106032^2 + 37723^2 .

It is a cyclic number.

It is not a de Polignac number, because 12665809753 - 2⁵ = 12665809721 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12665809753.

It is not an unprimeable number, because it can be changed into a prime (12665809703) 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, 26301 + ... + 161317.

It is an arithmetic number, because the mean of its divisors is an integer number (3166509645).

Almost surely, 2^12665809753 is an apocalyptic number.

It is an amenable number.

12665809753 is a deficient number, since it is larger than the sum of its proper divisors (228827).

12665809753 is an equidigital number, since it uses as much as digits as its factorization.

12665809753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228826.

The product of its (nonzero) digits is 2721600, while the sum is 52.

The spelling of 12665809753 in words is "twelve billion, six hundred sixty-five million, eight hundred nine thousand, seven hundred fifty-three".