Lost phone

Little over a month ago I lost my phone, for reasons I cannot explain for the life of me I can’t remember my iCloud sign in or password the only thing I have associated with the phone is the number, all the pictures of me and my daughter from birth through the last 2 1/2 years of her life are in that cloud and they are very important to me, does anybody know how I can access that information? I have an iPhone now that I could pair or sink or whatever I need to do with that icloud acct.