1. The problem is to add the numbers 5 and 53673737636378374637899383736637834. 2. The addition formula is $a + b = c$, where $a$ and $b$ are the numbers to add, and $c$ is the sum. 3. Here, $a = 5$ and $b = 53673737636378374637899383736637834$. 4. Adding these gives: $$5 + 53673737636378374637899383736637834 = 53673737636378374637899383736637839$$ 5. So, the final answer is $53673737636378374637899383736637839$.