Hex #664f7d or rgb(102,79,125) in RGB space is the tint of purple. It has hue angle of 270.00 degrees, value = 49 and saturation = 37. #664f7d can be obtained by mixing 4 colors: 1 drop of yellow, 5 drops of magenta, 4 drops of cyan, 5 drops of black.
Nearest safe hex - #666666. Below you can see the block with #664f7d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #664f7d to the mixer and play with it.