205066261 has 2 divisors, whose sum is σ = 205066262. Its totient is φ = 205066260.

The previous prime is 205066237. The next prime is 205066273. The reversal of 205066261 is 162660502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181737361 + 23328900 = 13481^2 + 4830^2 .

It is a cyclic number.

It is not a de Polignac number, because 205066261 - 2¹¹ = 205064213 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205066061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102533130 + 102533131.

It is an arithmetic number, because the mean of its divisors is an integer number (102533131).

Almost surely, 2^205066261 is an apocalyptic number.

It is an amenable number.

205066261 is a deficient number, since it is larger than the sum of its proper divisors (1).

205066261 is an equidigital number, since it uses as much as digits as its factorization.

205066261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 205066261 is about 14320.1348108179. The cubic root of 205066261 is about 589.7003754912.

The spelling of 205066261 in words is "two hundred five million, sixty-six thousand, two hundred sixty-one".