Reading the codeS14M-1400-55 is a S14M belt with a 1400mm pitch length and a 55mm width. The S at the front tells you it’s the Supertorque profile.
Counting teethPitch length divided by 14mm gives the tooth count, so a 1400mm S14M belt has 100 teeth.
Supertorque or HTD?An S14M belt has the same 14mm pitch as an 14M HTD belt, but the teeth are shaped differently and need S-profile pulleys. Replace like for like; if the old belt has no S in the code, it’s probably HTD.