Hex #664f67 or rgb(102,79,103) in RGB space is the tint of magenta. It has hue angle of 297.50 degrees, value = 40 and saturation = 23. #664f67 can be obtained by mixing 4 colors: 1 drop of red, 5 drops of magenta, 4 drops of blue, 5 drops of green.
Nearest safe hex - #666666. Below you can see the block with #664f67 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #664f67 to the mixer and play with it.