Hex #6690cc or rgb(102,144,204) in RGB space is the tint of blue. It has hue angle of 215.29 degrees, value = 80 and saturation = 50. #6690cc can be obtained by mixing 4 colors: 3 drops of magenta, 5 drops of cyan, 1 drop of white, 1 drop of black.
Nearest safe hex - #6699cc. Below you can see the block with #6690cc color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #6690cc to the mixer and play with it.