Hex #664cab or rgb(102,76,171) in RGB space is the tint of purple violet. It has hue angle of 256.42 degrees, value = 67 and saturation = 56. #664cab can be obtained by mixing 4 colors: 1 drop of red, 3 drops of magenta, 4 drops of blue, 2 drops of cyan.
Nearest safe hex - #663399. Below you can see the block with #664cab color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #664cab to the mixer and play with it.