12647462665 has 4 divisors (see below), whose sum is σ = 15176955204. Its totient is φ = 10117970128.

The previous prime is 12647462621. The next prime is 12647462693. The reversal of 12647462665 is 56626474621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56626474621 = 67 ⋅845171263.

It can be written as a sum of positive squares in 2 ways, for example, as 6440544009 + 6206918656 = 80253^2 + 78784^2 .

It is a cyclic number.

It is not a de Polignac number, because 12647462665 - 2²⁷ = 12513244937 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1264746262 + ... + 1264746271.

It is an arithmetic number, because the mean of its divisors is an integer number (3794238801).

Almost surely, 2^12647462665 is an apocalyptic number.

It is an amenable number.

12647462665 is a deficient number, since it is larger than the sum of its proper divisors (2529492539).

12647462665 is an equidigital number, since it uses as much as digits as its factorization.

12647462665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2529492538.

The product of its digits is 2903040, while the sum is 49.

The spelling of 12647462665 in words is "twelve billion, six hundred forty-seven million, four hundred sixty-two thousand, six hundred sixty-five".