Hex #668fd5 or rgb(102,143,213) in RGB space is the tint of blue violet. It has hue angle of 217.84 degrees, value = 84 and saturation = 52. #668fd5 can be obtained by mixing 4 colors: 2 drops of magenta, 3 drops of blue, 3 drops of cyan, 2 drops of white.
Nearest safe hex - #6699cc. Below you can see the block with #668fd5 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #668fd5 to the mixer and play with it.