Hex #664c9a or rgb(102,76,154) in RGB space is the tint of purple violet. It has hue angle of 260.00 degrees, value = 60 and saturation = 51. #664c9a can be obtained by mixing 4 colors: 1 drop of red, 1 drop of magenta, 2 drops of blue, 1 drop of cyan.
Nearest safe hex - #663399. Below you can see the block with #664c9a color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #664c9a to the mixer and play with it.