$xinput list
Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ 04CA00B1:00 04CA:00B1 Touchpad id=16 [slave pointer (2)]
⎜ ↳ 04CA00B1:00 04CA:00B1 Mouse id=17 [slave pointer (2)]
⎜ ↳ Logitech M720 Triathlon id=10 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
In this case the Touchpad id=16 so,
xinput set-prop 16 "Device Enabled" 0