Returns the index of the rightmost (lowest-order) one bit in this
BigInteger (the number of zero bits to the right of the rightmost
one bit). Returns -1 if this BigInteger contains no one bits.
(Computes {@code (this == 0? -1 : log2(this & -this))}.)
@return index of the rightmost one bit in this BigInteger.
Returns the index of the rightmost (lowest-order) one bit in this BigInteger (the number of zero bits to the right of the rightmost one bit). Returns -1 if this BigInteger contains no one bits. (Computes {@code (this == 0? -1 : log2(this & -this))}.)
@return index of the rightmost one bit in this BigInteger.