Google and Duckduckgo use floating point rather than arbitrary precision integers. Wolfram Alpha's solver is significantly more advanced (including arbitrary precision for integers and floating point numbers)
Python's default number implementation has full support for arbitrarily large numbers, and will allocate more memory as needed to do so, making the original claim correct.
((-80538738812075974)^3)+(80435758145817515^3)+(12602123297335631^3)