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BigInteger x = new BigInteger ("530500452766");
byte [] byteArray = x.toByteArray(); // convert to byte array
String s = new String(byteArray);    // s prints as "{„J?ž" -
                                     // the fourth character is invalid

// convert s back to a BigInteger
byteArray = s.getBytes();       // convert to bytes
x = new BigInteger(byteArray);  // now x = 530500435870

BigInteger x = new BigInteger ("530500452766");
String s = x.toString();  // valid character data

byte [] byteArray = s.getBytes("UTF8");
String ns = new String(byteArray, "UTF8");  // ns prints as "530500452766"

BigInteger x1 = new BigInteger(ns); // construct the original BigInteger