diff --git a/challenges/euler/readme.md b/challenges/euler/readme.md
index b23f697..91715b4 100644
--- a/challenges/euler/readme.md
+++ b/challenges/euler/readme.md
@@ -27,7 +27,7 @@ The source code can be found in the [src](src) directory. My thoughts about some
 -   [x] [14 - Longest Collatz sequence](src/14%20-%20Longest%20Collatz%20sequence.ts)
 -   [x] [15 - Lattice paths](src/15%20-%20Lattice%20paths.ts)
     -   [Thoughts](thoughts/15%20-%20Lattice%20paths.md)
--   [ ] 16 - Power digit sum
+-   [x] [16 - Power digit sum](src/16%20-%20Power%20digit%20sum.ts)
 -   [ ] 17 - Number letter counts
 -   [ ] 18 - Maximum path sum I
 -   [ ] 19 - Counting Sundays
diff --git a/challenges/euler/src/16 - Power digit sum.ts b/challenges/euler/src/16 - Power digit sum.ts
new file mode 100644
index 0000000..382745a
--- /dev/null
+++ b/challenges/euler/src/16 - Power digit sum.ts	
@@ -0,0 +1,15 @@
+export {};
+
+const powerDigitSum = (base: number, power: number) => {
+    const answer = BigInt(base ** power).toString();
+    let sum = 0;
+
+    for (let i = 0; i < answer.length; i++) {
+        const number = parseInt(answer[i]);
+        sum += number;
+    }
+
+    return sum;
+};
+
+console.log(powerDigitSum(2, 1000));