12413636561 has 4 divisors (see below), whose sum is σ = 12419930292. Its totient is φ = 12407342832.

The previous prime is 12413636537. The next prime is 12413636603. The reversal of 12413636561 is 16563631421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16563631421 = 31 ⋅534310691.

It can be written as a sum of positive squares in 2 ways, for example, as 4629985936 + 7783650625 = 68044^2 + 88225^2 .

It is a cyclic number.

It is not a de Polignac number, because 12413636561 - 2¹⁸ = 12413374417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12413636531) by changing a digit.

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, 3143906 + ... + 3147851.

It is an arithmetic number, because the mean of its divisors is an integer number (3104982573).

Almost surely, 2^12413636561 is an apocalyptic number.

It is an amenable number.

12413636561 is a deficient number, since it is larger than the sum of its proper divisors (6293731).

12413636561 is an equidigital number, since it uses as much as digits as its factorization.

12413636561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6293730.

The product of its digits is 77760, while the sum is 38.

The spelling of 12413636561 in words is "twelve billion, four hundred thirteen million, six hundred thirty-six thousand, five hundred sixty-one".