import java.math.BigInteger;

// Variable definitions
BigInteger _5, _4, powResult;
_5 = BigInteger.valueOf(5);
_4 = BigInteger.valueOf(4);

//calculations
powResult          = _5.pow(_4.pow(9).intValueExact());
String powStr      = powResult.toString();
int    powLen      = powStr.length();
String powStrStart = powStr.substring(0, 20);
String powStrEnd   = powStr.substring(powLen - 20);

//output
System.out.printf("5**4**3**2 = %s...%s and has %d digits%n", powStrStart, powStrEnd, powLen);