code: long divide(long v, MutableBigInteger quotient) {
          if (v == 0)
              throw new ArithmeticException("BigInteger divide by zero");
  
          // Dividend is zero
          if (intLen == 0) {
              quotient.intLen = quotient.offset = 0;
              return 0;
          }
          if (v < 0)
              v = -v;
  
          int d = (int)(v >>> 32);
          quotient.clear();
          // Special case on word divisor
          if (d == 0)
              return divideOneWord((int)v, quotient) & LONG_MASK;
          else {
              return divideLongMagnitude(v, quotient).toLong();
          }
      }
docs: Internally used  to calculate the quotient of this div v and places the
  quotient in the provided MutableBigInteger object and the remainder is
  returned.
  
  @return the remainder of the division will be returned.