12688334665 has 8 divisors (see below), whose sum is σ = 15245805960. Its totient is φ = 10137464832.

The previous prime is 12688334663. The next prime is 12688334753. The reversal of 12688334665 is 56643388621.

12688334665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2328352009 + 10359982656 = 48253^2 + 101784^2 .

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 12688334665 - 2¹ = 12688334663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12688334663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1646134 + ... + 1653823.

It is an arithmetic number, because the mean of its divisors is an integer number (1905725745).

Almost surely, 2^12688334665 is an apocalyptic number.

It is an amenable number.

12688334665 is a deficient number, since it is larger than the sum of its proper divisors (2557471295).

12688334665 is an equidigital number, since it uses as much as digits as its factorization.

12688334665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3300731.

The product of its digits is 4976640, while the sum is 52.

The spelling of 12688334665 in words is "twelve billion, six hundred eighty-eight million, three hundred thirty-four thousand, six hundred sixty-five".