Hex #175a6d or rgb(23,90,109) in RGB space is the tint of bluish cian. It has hue angle of 193.26 degrees, value = 43 and saturation = 79. #175a6d can be obtained by mixing 4 colors: 1 drop of yellow, 4 drops of blue, 2 drops of cyan, 4 drops of black.
Nearest safe hex - #006666. Below you can see the block with #175a6d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #175a6d to the mixer and play with it.