12565775238727 has 4 divisors (see below), whose sum is σ = 12565787484456. Its totient is φ = 12565762993000.

The previous prime is 12565775238703. The next prime is 12565775238743. The reversal of 12565775238727 is 72783257756521.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12565775238727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12565775238827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4427113 + ... + 6688114.

It is an arithmetic number, because the mean of its divisors is an integer number (3141446871114).

Almost surely, 2^{12565775238727} is an apocalyptic number.

12565775238727 is a deficient number, since it is larger than the sum of its proper divisors (12245729).

12565775238727 is a wasteful number, since it uses less digits than its factorization.

12565775238727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12245728.

The product of its digits is 345744000, while the sum is 67.

The spelling of 12565775238727 in words is "twelve trillion, five hundred sixty-five billion, seven hundred seventy-five million, two hundred thirty-eight thousand, seven hundred twenty-seven".