12565536965 has 4 divisors (see below), whose sum is σ = 15078644364. Its totient is φ = 10052429568.

The previous prime is 12565536953. The next prime is 12565536983. The reversal of 12565536965 is 56963556521.

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 9238669924 + 3326867041 = 96118^2 + 57679^2 .

It is a cyclic number.

It is not a de Polignac number, because 12565536965 - 2²⁰ = 12564488389 is a prime.

It is a super-2 number, since 2×12565536965² (a number of 21 digits) contains 22 as substring.

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, 1256553692 + ... + 1256553701.

It is an arithmetic number, because the mean of its divisors is an integer number (3769661091).

Almost surely, 2^12565536965 is an apocalyptic number.

It is an amenable number.

12565536965 is a deficient number, since it is larger than the sum of its proper divisors (2513107399).

12565536965 is an equidigital number, since it uses as much as digits as its factorization.

12565536965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2513107398.

The product of its digits is 7290000, while the sum is 53.

The spelling of 12565536965 in words is "twelve billion, five hundred sixty-five million, five hundred thirty-six thousand, nine hundred sixty-five".