12504660565 has 4 divisors (see below), whose sum is σ = 15005592684. Its totient is φ = 10003728448.

The previous prime is 12504660559. The next prime is 12504660599. The reversal of 12504660565 is 56506640521.

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 1456338244 + 11048322321 = 38162^2 + 105111^2 .

It is a cyclic number.

It is not a de Polignac number, because 12504660565 - 2⁹ = 12504660053 is a prime.

It is a super-2 number, since 2×12504660565² (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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1250466052 + ... + 1250466061.

It is an arithmetic number, because the mean of its divisors is an integer number (3751398171).

Almost surely, 2^12504660565 is an apocalyptic number.

It is an amenable number.

12504660565 is a deficient number, since it is larger than the sum of its proper divisors (2500932119).

12504660565 is an equidigital number, since it uses as much as digits as its factorization.

12504660565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2500932118.

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 12504660565 in words is "twelve billion, five hundred four million, six hundred sixty thousand, five hundred sixty-five".