Hex #666199 or rgb(102,97,153) in RGB space is the tint of violet. It has hue angle of 245.36 degrees, value = 60 and saturation = 37. #666199 can be obtained by mixing 4 colors: 3 drops of magenta, 3 drops of cyan, 1 drop of white, 3 drops of black.
Nearest safe hex - #666699. Below you can see the block with #666199 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #666199 to the mixer and play with it.