205608712243 has 4 divisors (see below), whose sum is σ = 224300413368. Its totient is φ = 186917011120.

The previous prime is 205608712229. The next prime is 205608712297. The reversal of 205608712243 is 342217806502.

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 205608712243 - 2⁹ = 205608711731 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205608712196 and 205608712205.

It is not an unprimeable number, because it can be changed into a prime (205608712213) 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, 9345850546 + ... + 9345850567.

It is an arithmetic number, because the mean of its divisors is an integer number (56075103342).

Almost surely, 2^205608712243 is an apocalyptic number.

205608712243 is a deficient number, since it is larger than the sum of its proper divisors (18691701125).

205608712243 is a wasteful number, since it uses less digits than its factorization.

205608712243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18691701124.

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 205608712243 in words is "two hundred five billion, six hundred eight million, seven hundred twelve thousand, two hundred forty-three".