12646133874565 has 4 divisors (see below), whose sum is σ = 15175360649484. Its totient is φ = 10116907099648.

The previous prime is 12646133874551. The next prime is 12646133874599. The reversal of 12646133874565 is 56547833164621.

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 9409783246369 + 3236350628196 = 3067537^2 + 1798986^2 .

It is a cyclic number.

It is not a de Polignac number, because 12646133874565 - 2⁵ = 12646133874533 is a prime.

It is a Duffinian number.

It is a congruent 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, 1264613387452 + ... + 1264613387461.

It is an arithmetic number, because the mean of its divisors is an integer number (3793840162371).

Almost surely, 2^{12646133874565} is an apocalyptic number.

It is an amenable number.

12646133874565 is a deficient number, since it is larger than the sum of its proper divisors (2529226774919).

12646133874565 is an equidigital number, since it uses as much as digits as its factorization.

12646133874565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2529226774918.

The product of its digits is 87091200, while the sum is 61.

The spelling of 12646133874565 in words is "twelve trillion, six hundred forty-six billion, one hundred thirty-three million, eight hundred seventy-four thousand, five hundred sixty-five".