206065205023261 has 2 divisors, whose sum is σ = 206065205023262. Its totient is φ = 206065205023260.

The previous prime is 206065205023229. The next prime is 206065205023303. The reversal of 206065205023261 is 162320502560602.

206065205023261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154758426757636 + 51306778265625 = 12440194^2 + 7162875^2 .

It is a cyclic number.

It is not a de Polignac number, because 206065205023261 - 2⁵ = 206065205023229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206065205021261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103032602511630 + 103032602511631.

It is an arithmetic number, because the mean of its divisors is an integer number (103032602511631).

Almost surely, 2^{206065205023261} is an apocalyptic number.

It is an amenable number.

206065205023261 is a deficient number, since it is larger than the sum of its proper divisors (1).

206065205023261 is an equidigital number, since it uses as much as digits as its factorization.

206065205023261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 40.

Adding to 206065205023261 its reverse (162320502560602), we get a palindrome (368385707583863).

The spelling of 206065205023261 in words is "two hundred six trillion, sixty-five billion, two hundred five million, twenty-three thousand, two hundred sixty-one".