---
id: 5900f40d1000cf542c50ff1f
title: 'Problem 160: Factorial trailing digits'
challengeType: 5
forumTopicId: 301794
dashedName: problem-160-factorial-trailing-digits
---

# --description--

For any N, let f(N) be the last five digits before the trailing zeroes in N!.

For example,

9! = 362880 so f(9)=36288

10! = 3628800 so f(10)=36288

20! = 2432902008176640000 so f(20)=17664

Find f(1,000,000,000,000)

# --hints--

`euler160()` should return 16576.

```js
assert.strictEqual(euler160(), 16576);
```

# --seed--

## --seed-contents--

```js
function euler160() {

  return true;
}

euler160();
```

# --solutions--

```js
// solution required
```