Hex #666f83 or rgb(102,111,131) in RGB space is the tint of blue violet. It has hue angle of 221.38 degrees, value = 51 and saturation = 22. #666f83 can be obtained by mixing 4 colors: 2 drops of yellow, 4 drops of magenta, 5 drops of cyan, 4 drops of black.
Nearest safe hex - #666699. Below you can see the block with #666f83 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #666f83 to the mixer and play with it.