205666229 has 2 divisors, whose sum is σ = 205666230. Its totient is φ = 205666228.

The previous prime is 205666217. The next prime is 205666259. The reversal of 205666229 is 922666502.

It is a happy number.

205666229 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., 190495204 + 15171025 = 13802^2 + 3895^2 .

It is a cyclic number.

It is not a de Polignac number, because 205666229 - 2⁸ = 205665973 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 205666192 and 205666201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205666259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102833114 + 102833115.

It is an arithmetic number, because the mean of its divisors is an integer number (102833115).

Almost surely, 2^205666229 is an apocalyptic number.

It is an amenable number.

205666229 is a deficient number, since it is larger than the sum of its proper divisors (1).

205666229 is an equidigital number, since it uses as much as digits as its factorization.

205666229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 205666229 is about 14341.0679169998. The cubic root of 205666229 is about 590.2749164075.

The spelling of 205666229 in words is "two hundred five million, six hundred sixty-six thousand, two hundred twenty-nine".