Hex #666d88 or rgb(102,109,136) in RGB space is the tint of blue violet. It has hue angle of 227.65 degrees, value = 53 and saturation = 25. #666d88 can be obtained by mixing 3 colors: 2 drops of red, 1 drop of blue, 2 drops of cyan.
Nearest safe hex - #666699. Below you can see the block with #666d88 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #666d88 to the mixer and play with it.