Hex #664980 or rgb(102,73,128) in RGB space is the tint of purple. It has hue angle of 271.64 degrees, value = 50 and saturation = 43. #664980 can be obtained by mixing 4 colors: 3 drops of magenta, 2 drops of cyan, 1 drop of white, 4 drops of black.
Nearest safe hex - #663399. Below you can see the block with #664980 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #664980 to the mixer and play with it.