206066321 has 2 divisors, whose sum is σ = 206066322. Its totient is φ = 206066320.

The previous prime is 206066309. The next prime is 206066347. The reversal of 206066321 is 123660602.

It is an a-pointer prime, because the next prime (206066347) can be obtained adding 206066321 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205779025 + 287296 = 14345^2 + 536^2 .

It is a cyclic number.

It is not a de Polignac number, because 206066321 - 2¹⁰ = 206065297 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (206066351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103033160 + 103033161.

It is an arithmetic number, because the mean of its divisors is an integer number (103033161).

Almost surely, 2^206066321 is an apocalyptic number.

It is an amenable number.

206066321 is a deficient number, since it is larger than the sum of its proper divisors (1).

206066321 is an equidigital number, since it uses as much as digits as its factorization.

206066321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 206066321 is about 14355.0103099928. The cubic root of 206066321 is about 590.6574314788.

The spelling of 206066321 in words is "two hundred six million, sixty-six thousand, three hundred twenty-one".