The Pixel 7 and 7 Pro are the first 64-bit only Android phones
Using only 64-bit apps also improves how secure your phone is. That’s because of the bigger address space that allows for the use of address space layout randomization (ASLR) which prevents attackers from taking advantage of memory corruption created by bugs. Creating 64-bit apps also give developers better tools for finding memory errors and improving the quality of an app. The move to 64-bit apps can also lead phone manufacturers to disseminate updates faster and more easily.
The company is also telling app developers that “While 64-bit-only devices will grow in popularity with phones joining Android Auto in this group, 32-bit-only devices will continue to be important for Android Go, Android TV, and Android Wear.”