12561065563 has 2 divisors, whose sum is σ = 12561065564. Its totient is φ = 12561065562.

The previous prime is 12561065557. The next prime is 12561065591. The reversal of 12561065563 is 36556016521.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12561065563 is a prime.

It is not a weakly prime, because it can be changed into another prime (12561065533) 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 as a sum of consecutive naturals, namely, 6280532781 + 6280532782.

It is an arithmetic number, because the mean of its divisors is an integer number (6280532782).

Almost surely, 2^12561065563 is an apocalyptic number.

12561065563 is a deficient number, since it is larger than the sum of its proper divisors (1).

12561065563 is an equidigital number, since it uses as much as digits as its factorization.

12561065563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 12561065563 in words is "twelve billion, five hundred sixty-one million, sixty-five thousand, five hundred sixty-three".