12566597653 has 16 divisors (see below), whose sum is σ = 13469170176. Its totient is φ = 11698038000.

The previous prime is 12566597597. The next prime is 12566597669. The reversal of 12566597653 is 35679566521.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12566597653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12566597594 and 12566597603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12566537653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78778 + ... + 177028.

It is an arithmetic number, because the mean of its divisors is an integer number (841823136).

Almost surely, 2^12566597653 is an apocalyptic number.

It is an amenable number.

12566597653 is a deficient number, since it is larger than the sum of its proper divisors (902572523).

12566597653 is an equidigital number, since it uses as much as digits as its factorization.

12566597653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98424.

The product of its digits is 10206000, while the sum is 55.

The spelling of 12566597653 in words is "twelve billion, five hundred sixty-six million, five hundred ninety-seven thousand, six hundred fifty-three".