...
We can always go back to the primitive types if the BigInteger of course can be represented by the type
In the example if big_long is within long range (big_long < Long.MAX_VALUE && big_long > Long.MIN_VALUE) we can use the BigInteger method longValue() to get the long value and assign it to a variable of type long
Integer overflow can lead to buffer overflows and the execution of arbitrary code by an attacker.
Risk Assesment
Integer overflows are among the most dangerous defects in software since it leads to exploitation, undefined and erroneous behavior
...