206445563 has 2 divisors, whose sum is σ = 206445564. Its totient is φ = 206445562.

The previous prime is 206445541. The next prime is 206445587. The reversal of 206445563 is 365544602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 206445563 - 2²⁰ = 205396987 is a prime.

It is not a weakly prime, because it can be changed into another prime (206445593) 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, 103222781 + 103222782.

It is an arithmetic number, because the mean of its divisors is an integer number (103222782).

Almost surely, 2^206445563 is an apocalyptic number.

206445563 is a deficient number, since it is larger than the sum of its proper divisors (1).

206445563 is an equidigital number, since it uses as much as digits as its factorization.

206445563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 35.

The square root of 206445563 is about 14368.2136328773. The cubic root of 206445563 is about 591.0195557177.

The spelling of 206445563 in words is "two hundred six million, four hundred forty-five thousand, five hundred sixty-three".