205323434563 has 4 divisors (see below), whose sum is σ = 221117544928. Its totient is φ = 189529324200.

The previous prime is 205323434531. The next prime is 205323434579. The reversal of 205323434563 is 365434323502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 205323434563 - 2⁵ = 205323434531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205323432563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7897055163 + ... + 7897055188.

It is an arithmetic number, because the mean of its divisors is an integer number (55279386232).

Almost surely, 2^205323434563 is an apocalyptic number.

205323434563 is a deficient number, since it is larger than the sum of its proper divisors (15794110365).

205323434563 is a wasteful number, since it uses less digits than its factorization.

205323434563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15794110364.

The product of its (nonzero) digits is 777600, while the sum is 40.

The spelling of 205323434563 in words is "two hundred five billion, three hundred twenty-three million, four hundred thirty-four thousand, five hundred sixty-three".