205505495559 has 24 divisors (see below), whose sum is σ = 365343104672. Its totient is φ = 108398502720.

The previous prime is 205505495431. The next prime is 205505495579. The reversal of 205505495559 is 955594505502.

It is not a de Polignac number, because 205505495559 - 2⁷ = 205505495431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205505495579) 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 in 23 ways as a sum of consecutive naturals, for example, 125460412 + ... + 125462049.

Almost surely, 2^205505495559 is an apocalyptic number.

205505495559 is a deficient number, since it is larger than the sum of its proper divisors (159837609113).

205505495559 is a wasteful number, since it uses less digits than its factorization.

205505495559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250922487 (or 250922484 counting only the distinct ones).

The product of its (nonzero) digits is 10125000, while the sum is 54.

The spelling of 205505495559 in words is "two hundred five billion, five hundred five million, four hundred ninety-five thousand, five hundred fifty-nine".