205323053543 has 4 divisors (see below), whose sum is σ = 217400880240. Its totient is φ = 193245226848.

The previous prime is 205323053527. The next prime is 205323053561. The reversal of 205323053543 is 345350323502.

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 205323053543 - 2⁴ = 205323053527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205323053513) 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, 6038913323 + ... + 6038913356.

It is an arithmetic number, because the mean of its divisors is an integer number (54350220060).

Almost surely, 2^205323053543 is an apocalyptic number.

205323053543 is a deficient number, since it is larger than the sum of its proper divisors (12077826697).

205323053543 is a wasteful number, since it uses less digits than its factorization.

205323053543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12077826696.

The product of its (nonzero) digits is 162000, while the sum is 35.

The spelling of 205323053543 in words is "two hundred five billion, three hundred twenty-three million, fifty-three thousand, five hundred forty-three".