IPhone 5c deleted app still showing up in storage?

I deleted an app a while ago but when I go on to storage in my settings it still says it's there but it doesn't have a name or picture and it takes up 600+ mb, and when I try to delete it it says delte (null) but just comes back whenever I look again

Hold the power and home button until you see the apple logo(make sure it is not plugged into computer, or will mess up phone)to restart the phone