```java
BigInteger i = BigInteger.valueOf(0xFFFFFFFFFFFFFFFFL);
System.out.println("63 = " + i.testBit(63));
System.out.println("64 = " + i.testBit(64));
System.out.println("65 = " + i.testBit(65));
System.out.println("1000 = " + i.testBit(1000));
```
```
63 = true
64 = true
65 = true
1000 = true
```