561166163 has 2 divisors, whose sum is σ = 561166164. Its totient is φ = 561166162.

The previous prime is 561166147. The next prime is 561166187. The reversal of 561166163 is 361661165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561166163 - 2⁴ = 561166147 is a prime.

It is a super-2 number, since 2×561166163² = 629814924992285138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (561166363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280583081 + 280583082.

It is an arithmetic number, because the mean of its divisors is an integer number (280583082).

Almost surely, 2^561166163 is an apocalyptic number.

561166163 is a deficient number, since it is larger than the sum of its proper divisors (1).

561166163 is an equidigital number, since it uses as much as digits as its factorization.

561166163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 35.

The square root of 561166163 is about 23688.9460086345. The cubic root of 561166163 is about 824.8288168857.

The spelling of 561166163 in words is "five hundred sixty-one million, one hundred sixty-six thousand, one hundred sixty-three".