Exporting options

Im not too familiar with bit rates much. If u export with the 64bit option does it make the audio file better quality at all? also i have read songs are usually 41000 (i usually leave these alone) unless used with a video its 48000, is there any justification to export as 48000 instead of 41000 for a normal song to be used on a CD such as better audio quality?

thank you, was just curiousity i usually always just leave its 44.1 and 16bit mp3. When im exporting my mix to load into another template for doing my own mastering i export wave 32 bit usually.