563866561 has 2 divisors, whose sum is σ = 563866562. Its totient is φ = 563866560.

The previous prime is 563866549. The next prime is 563866577. The reversal of 563866561 is 165668365.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 363474225 + 200392336 = 19065^2 + 14156^2 .

It is a cyclic number.

It is not a de Polignac number, because 563866561 - 2⁹ = 563866049 is a prime.

It is a super-2 number, since 2×563866561² = 635890997227933442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (563866361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 281933280 + 281933281.

It is an arithmetic number, because the mean of its divisors is an integer number (281933281).

Almost surely, 2^563866561 is an apocalyptic number.

It is an amenable number.

563866561 is a deficient number, since it is larger than the sum of its proper divisors (1).

563866561 is an equidigital number, since it uses as much as digits as its factorization.

563866561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 777600, while the sum is 46.

The square root of 563866561 is about 23745.8746101297. The cubic root of 563866561 is about 826.1497582705.

The spelling of 563866561 in words is "five hundred sixty-three million, eight hundred sixty-six thousand, five hundred sixty-one".