205505563 has 2 divisors, whose sum is σ = 205505564. Its totient is φ = 205505562.

The previous prime is 205505551. The next prime is 205505579. The reversal of 205505563 is 365505502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205505563 - 2⁹ = 205505051 is a prime.

It is not a weakly prime, because it can be changed into another prime (205505543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102752781 + 102752782.

It is an arithmetic number, because the mean of its divisors is an integer number (102752782).

Almost surely, 2^205505563 is an apocalyptic number.

205505563 is a deficient number, since it is larger than the sum of its proper divisors (1).

205505563 is an equidigital number, since it uses as much as digits as its factorization.

205505563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22500, while the sum is 31.

The square root of 205505563 is about 14335.4652174249. The cubic root of 205505563 is about 590.1211692149.

The spelling of 205505563 in words is "two hundred five million, five hundred five thousand, five hundred sixty-three".