205056873839 has 4 divisors (see below), whose sum is σ = 205211401824. Its totient is φ = 204902345856.

The previous prime is 205056873821. The next prime is 205056873869. The reversal of 205056873839 is 938378650502.

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 205056873839 - 2³⁶ = 136337397103 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 (205056873869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77262002 + ... + 77264655.

It is an arithmetic number, because the mean of its divisors is an integer number (51302850456).

Almost surely, 2^205056873839 is an apocalyptic number.

205056873839 is a deficient number, since it is larger than the sum of its proper divisors (154527985).

205056873839 is a wasteful number, since it uses less digits than its factorization.

205056873839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154527984.

The product of its (nonzero) digits is 10886400, while the sum is 56.

The spelling of 205056873839 in words is "two hundred five billion, fifty-six million, eight hundred seventy-three thousand, eight hundred thirty-nine".