205250520144161 has 4 divisors (see below), whose sum is σ = 205250560767300. Its totient is φ = 205250479521024.

The previous prime is 205250520144157. The next prime is 205250520144217. The reversal of 205250520144161 is 161441025052502.

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 51772342090000 + 153478178054161 = 7195300^2 + 12388631^2 .

It is a cyclic number.

It is not a de Polignac number, because 205250520144161 - 2² = 205250520144157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (205250520144121) 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, 11441576 + ... + 23268233.

It is an arithmetic number, because the mean of its divisors is an integer number (51312640191825).

Almost surely, 2^{205250520144161} is an apocalyptic number.

It is an amenable number.

205250520144161 is a deficient number, since it is larger than the sum of its proper divisors (40623139).

205250520144161 is an equidigital number, since it uses as much as digits as its factorization.

205250520144161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40623138.

The product of its (nonzero) digits is 96000, while the sum is 38.

Adding to 205250520144161 its reverse (161441025052502), we get a palindrome (366691545196663).

The spelling of 205250520144161 in words is "two hundred five trillion, two hundred fifty billion, five hundred twenty million, one hundred forty-four thousand, one hundred sixty-one".