How to get biggest BigDecimal value

Question

How can I get the largest possible value of a BigDecimal variable can hold? (Preferably programmatically, but hardcoding would be ok too)

EDIT
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Answer 1

Given enough RAM, the value is approximately:

2²⁴⁰*10²³²

(It's definitely out by a few orders of magnitude but in relative terms it's a very precise estimate.)