Hex #666291 or rgb(102,98,145) in RGB space is the tint of violet. It has hue angle of 245.11 degrees, value = 57 and saturation = 32. #666291 can be obtained by mixing 4 colors: 1 drop of magenta, 3 drops of blue, 3 drops of white, 3 drops of black.
Nearest safe hex - #666699. Below you can see the block with #666291 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #666291 to the mixer and play with it.