ADC precision (10bits or 16 bits?)

I’m checking the datasheet and it says the mcu has 16 bit ADCs.

Arduino’s API says analogRead returns 10 bits.

Experimentally, I’m seeing 10 bits so is there a way to get the full 16 bits?

Nevermind, found answer through google: https://community.konekt.io/t/analog-sensor-output-analogread/213