Hex #664c89 or rgb(102,76,137) in RGB space is the tint of purple. It has hue angle of 265.57 degrees, value = 54 and saturation = 45. #664c89 can be obtained by mixing 4 colors: 3 drops of red, 1 drop of magenta, 4 drops of blue, 2 drops of cyan.
Nearest safe hex - #663399. Below you can see the block with #664c89 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #664c89 to the mixer and play with it.