The problem is not with BigInt, but with the literal on the right that cannot be evaluated.
scala> 1881676371789154860897069000 <console>:1: error: integer number too large 1881676371789154860897069000
BigInt can be initialized with string
scala> BigInt("12345667890087234578023089723457234705892375071881676371789154860897069000") res0: scala.math.BigInt = 12345667890087234578023089723457234705892375071881676371789154860897069000
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The problem is not with BigInt, but with the literal on the right that cannot be evaluated.
BigInt can be initialized with string