205042535543 has 12 divisors (see below), whose sum is σ = 216707725080. Its totient is φ = 193976602416.

The previous prime is 205042535443. The next prime is 205042535597. The reversal of 205042535543 is 345535240502.

It is not a de Polignac number, because 205042535543 - 2¹⁰ = 205042534519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205042535497 and 205042535506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205042535443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144605 + ... + 656502.

It is an arithmetic number, because the mean of its divisors is an integer number (18058977090).

Almost surely, 2^205042535543 is an apocalyptic number.

205042535543 is a deficient number, since it is larger than the sum of its proper divisors (11665189537).

205042535543 is an equidigital number, since it uses as much as digits as its factorization.

205042535543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801854 (or 801835 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 38.

The spelling of 205042535543 in words is "two hundred five billion, forty-two million, five hundred thirty-five thousand, five hundred forty-three".