What is the type of AC power in Power supply/Adaptor rating?
It’s unlikely that you would get a meaningful power factor - the 1.6A is presumably the maximum at the lowest supply voltage (100V) and probably has a safety margin built in.  The difference between the ongoing and outgoing power gives you the efficiency of the device (about 85% is typical).  Measuring the power factor is a more complex task; there are a few ways to measure it.