---
title: "LeetCode #3370: Smallest Number With All Set Bits"
url: https://perrotta.dev/2026/01/leetcode-%233370-smallest-number-with-all-set-bits/
last_updated: 2026-01-06
---


[LeetCode #3370: Smallest Number With All Set Bits](https://leetcode.com/problems/smallest-number-with-all-set-bits):

```python
class Solution:
    def smallestNumber(self, n: int) -> int:
        return n | (1 << n.bit_length()) - 1
```