Hex #663a78 or rgb(102,58,120) in RGB space is the tint of purple magenta. It has hue angle of 282.58 degrees, value = 47 and saturation = 52. #663a78 can be obtained by mixing 4 colors: 4 drops of magenta, 3 drops of blue, 2 drops of green, 1 drop of black.
Nearest safe hex - #663366. Below you can see the block with #663a78 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #663a78 to the mixer and play with it.