Hex #6684a5 or rgb(102,132,165) in RGB space is the tint of blue. It has hue angle of 211.43 degrees, value = 65 and saturation = 38. #6684a5 can be obtained by mixing 4 colors: 4 drops of red, 4 drops of blue, 5 drops of cyan, 2 drops of white.
Nearest safe hex - #669999. Below you can see the block with #6684a5 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #6684a5 to the mixer and play with it.