I was trying to look at the battery usage of different apps and saw this weird app named "-5" on inspection it takes me to google photos which is weird since why will google photos use its name as "-5". I can't find any reasoning for this and want others to shed some light on this topic. I have also reported this weird behavior to google as well.
I did a search in Play Store for "-5" with no results, also on YEE ole great god Google. Not much returned.
I would start with your phone service provider. They are suppose to give you a level of device support. I've personally stumped the US Cellular chumps before. Give it a try. They do keep a knowledge base of customer calls. Who knows, you might be lucky. Else download "HouseCall" from the Play Store, it is a TrendMicro manual scan for nasty things. It is very powerful. Free, only runs's when you run it. TrendMicro has a variety of very good pay products for Android and web safe stuff. Good luck.
It's for Wireless hotspot. Other users have reported same. read more about here