561606163 has 2 divisors, whose sum is σ = 561606164. Its totient is φ = 561606162.

The previous prime is 561606139. The next prime is 561606167. The reversal of 561606163 is 361606165.

561606163 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561606163 - 2²⁵ = 528051731 is a prime.

It is not a weakly prime, because it can be changed into another prime (561606167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280803081 + 280803082.

It is an arithmetic number, because the mean of its divisors is an integer number (280803082).

Almost surely, 2^561606163 is an apocalyptic number.

561606163 is a deficient number, since it is larger than the sum of its proper divisors (1).

561606163 is an equidigital number, since it uses as much as digits as its factorization.

561606163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 561606163 is about 23698.2312209160. The cubic root of 561606163 is about 825.0443382354.

The spelling of 561606163 in words is "five hundred sixty-one million, six hundred six thousand, one hundred sixty-three".