Hex #667883 or rgb(102,120,131) in RGB space is the tint of blue. It has hue angle of 202.76 degrees, value = 51 and saturation = 22. #667883 can be obtained by mixing 4 colors: 1 drop of yellow, 4 drops of blue, 5 drops of white, 5 drops of black.
Nearest safe hex - #666699. Below you can see the block with #667883 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #667883 to the mixer and play with it.