205709548161 has 8 divisors (see below), whose sum is σ = 295377812800. Its totient is φ = 126590491152.

The previous prime is 205709548157. The next prime is 205709548171. The reversal of 205709548161 is 161845907502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 205709548161 - 2² = 205709548157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205709548161.

It is not an unprimeable number, because it can be changed into a prime (205709548111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2637301861 + ... + 2637301938.

It is an arithmetic number, because the mean of its divisors is an integer number (36922226600).

Almost surely, 2^205709548161 is an apocalyptic number.

It is an amenable number.

205709548161 is a deficient number, since it is larger than the sum of its proper divisors (89668264639).

205709548161 is a wasteful number, since it uses less digits than its factorization.

205709548161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5274603815.

The product of its (nonzero) digits is 604800, while the sum is 48.

The spelling of 205709548161 in words is "two hundred five billion, seven hundred nine million, five hundred forty-eight thousand, one hundred sixty-one".