Hex #664c78 or rgb(102,76,120) in RGB space is the tint of purple. It has hue angle of 275.45 degrees, value = 47 and saturation = 37. #664c78 can be obtained by mixing 3 colors: 4 drops of magenta, 3 drops of blue, 3 drops of green.
Nearest safe hex - #663366. Below you can see the block with #664c78 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #664c78 to the mixer and play with it.