Hex #173665 or rgb(23,54,101) in RGB space is the tint of blue. It has hue angle of 216.15 degrees, value = 40 and saturation = 77. #173665 can be obtained by mixing 4 colors: 1 drop of red, 5 drops of blue, 1 drop of cyan, 4 drops of black.
Nearest safe hex - #003366. Below you can see the block with #173665 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #173665 to the mixer and play with it.