Hex #177f8b or rgb(23,127,139) in RGB space is the tint of cyan. It has hue angle of 186.21 degrees, value = 55 and saturation = 83. #177f8b can be obtained by mixing 4 colors: 1 drop of yellow, 3 drops of blue, 4 drops of cyan, 3 drops of black.
Nearest safe hex - #006699. Below you can see the block with #177f8b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #177f8b to the mixer and play with it.