12236563561 has 2 divisors, whose sum is σ = 12236563562. Its totient is φ = 12236563560.

The previous prime is 12236563553. The next prime is 12236563589. The reversal of 12236563561 is 16536563221.

12236563561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12236563161 + 400 = 110619^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 12236563561 - 2³ = 12236563553 is a prime.

It is not a weakly prime, because it can be changed into another prime (12236563861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6118281780 + 6118281781.

It is an arithmetic number, because the mean of its divisors is an integer number (6118281781).

Almost surely, 2^12236563561 is an apocalyptic number.

It is an amenable number.

12236563561 is a deficient number, since it is larger than the sum of its proper divisors (1).

12236563561 is an equidigital number, since it uses as much as digits as its factorization.

12236563561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 40.

The spelling of 12236563561 in words is "twelve billion, two hundred thirty-six million, five hundred sixty-three thousand, five hundred sixty-one".