The same way you just spelled it. Fifty.
fifty
fifty nine
"Fifty"
Fifty-six
The number fifty-five is spelled as "fünfundfünfzig" in German.
The ordinal number 50th is spelled fiftieth.
The English spelling of the number 50 is fifty.
The spelling of the ordinal number 51st is "fifty-first."
cinquante huit
The number 50000 or 50,000 is "fifty thousand."
The number 52 is spelled fifty-two.
The likely word is the number fifty (50).