Hex #55697b or rgb(85,105,123) in RGB space is the tint of blue. It has hue angle of 208.42 degrees, value = 48 and saturation = 31. #55697b can be obtained by mixing 4 colors: 1 drop of yellow, 2 drops of magenta, 3 drops of cyan, 3 drops of black.
Nearest safe hex - #666666. Below you can see the block with #55697b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55697b to the mixer and play with it.