FFMPEG - The result of converting video to hevc format lost audio (video only)
There is so much wrong with your command that it would take too long to list every issue. It will be simplest to just provide a corrected command:

ffmpeg -i input -c:v libx265 -crf 28 -c:a aac -b:a 128k -filter:v "scale=650:-2,format=yuv420p" -tag:v hvc1 -movflags +faststart output.mp4



If the input audio is already AAC consider stream copying with -c:a copy instead of re-encoding.
Depending on the input format this may not be worth the time, energy, and effort. Results may not be satisfactory if you are re-encoding lossy content. The artifacts present in the input can complicate the compression and result in a higher than expected file size and/or lower than expected quality.


For more info see:


FFmpeg Wiki: H.265
FFmpeg Wiki: AAC