fifty vs large integer

fifty and large integer both are nouns.

Word	Noun	Adjective	Verb	Adverb
fifty	Yes	Yes	No	No
large integer	Yes	No	No	No

As nouns, large integer is a hypernym of fifty; that is, large integer is a word with a broader meaning than fifty:

fifty (noun)	large integer (noun)
a United States bill worth 50 dollars	an integer equal to or greater than ten
the cardinal number that is the product of ten and five

fifty (adjective)	large integer (adjective)
being ten more than forty