Hex #664f77 or rgb(102,79,119) in RGB space is the tint of purple. It has hue angle of 274.50 degrees, value = 47 and saturation = 34. #664f77 can be obtained by mixing 4 colors: 1 drop of red, 2 drops of blue, 1 drop of white, 1 drop of black.
Nearest safe hex - #666666. Below you can see the block with #664f77 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #664f77 to the mixer and play with it.