Hex #668eb3 or rgb(102,142,179) in RGB space is the tint of blue. It has hue angle of 208.83 degrees, value = 70 and saturation = 43. #668eb3 can be obtained by mixing 4 colors: 1 drop of yellow, 3 drops of magenta, 5 drops of cyan, 1 drop of black.
Nearest safe hex - #6699cc. Below you can see the block with #668eb3 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #668eb3 to the mixer and play with it.