204543068161 has 4 divisors (see below), whose sum is σ = 209531923524. Its totient is φ = 199554212800.

The previous prime is 204543068153. The next prime is 204543068173. The reversal of 204543068161 is 161860345402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 98319873600 + 106223194561 = 313560^2 + 325919^2 .

It is a cyclic number.

It is not a de Polignac number, because 204543068161 - 2³ = 204543068153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204543068461) 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, 2494427620 + ... + 2494427701.

It is an arithmetic number, because the mean of its divisors is an integer number (52382980881).

Almost surely, 2^204543068161 is an apocalyptic number.

It is an amenable number.

204543068161 is a deficient number, since it is larger than the sum of its proper divisors (4988855363).

204543068161 is an equidigital number, since it uses as much as digits as its factorization.

204543068161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4988855362.

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 204543068161 in words is "two hundred four billion, five hundred forty-three million, sixty-eight thousand, one hundred sixty-one".