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BigInteger x = new BigInteger("530500452766");
byte // convert x to a String
byte[] byteArray = x.toByteArray(); // convert to byte array
String s = new String(byteArray);    // s prints as "{,J?z" -
                                     // 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

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

  // construct the original BigInteger
  BigInteger x1 = new BigInteger(ns); 
} catch (UnsupportedEncodingException ex) {
  // handle error
}