How to center an unordered list?

ul {
  display: table;
  margin: 0 auto;
}

<html>

<body>
  <ul>
    <li>56456456</li>
    <li>4564564564564649999999999999999999999999999996</li>
    <li>45645</li>
  </ul>
</body>

</html>