Hex #55739c or rgb(85,115,156) in RGB space is the tint of blue. It has hue angle of 214.65 degrees, value = 61 and saturation = 46. #55739c can be obtained by mixing 3 colors: 5 drops of blue, 4 drops of white, 3 drops of black.
Nearest safe hex - #666699. Below you can see the block with #55739c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55739c to the mixer and play with it.