# FLOAT64_MAX_SAFE_NTH_FACTORIAL
> Maximum safe nth [factorial][factorial] when stored in [double-precision floating-point][ieee754] format.
## Usage
```javascript
var FLOAT64_MAX_SAFE_NTH_FACTORIAL = require( '@stdlib/constants/float64/max-safe-nth-factorial' );
```
#### FLOAT64_MAX_SAFE_NTH_FACTORIAL
The maximum [safe][safe-integers] nth [factorial][factorial] when stored in [double-precision floating-point][ieee754] format.
```javascript
var bool = ( FLOAT64_MAX_SAFE_NTH_FACTORIAL === 170 );
// returns true
```
## Examples
```javascript
var FLOAT64_MAX_SAFE_NTH_FACTORIAL = require( '@stdlib/constants/float64/max-safe-nth-factorial' );
function factorial( n ) {
var a;
var i;
a = 1;
for ( i = 2; i <= n; i++ ) {
a *= i;
}
return a;
}
for ( i = 0; i < 200; i++ ) {
v = factorial( i );
if ( i > FLOAT64_MAX_SAFE_NTH_FACTORIAL ) {
console.log( 'Unsafe: %d', v );
} else {
console.log( 'Safe: %d', v );
}
}
```
* * *
## C APIs
### Usage
```c
#include "stdlib/constants/float64/max_safe_nth_factorial.h"
```
#### STDLIB_CONSTANT_FLOAT64_MAX_SAFE_NTH_FACTORIAL
Macro for the maximum [safe][safe-integers] nth [factorial][factorial] when stored in [double-precision floating-point][ieee754] format.
[safe-integers]: http://www.2ality.com/2013/10/safe-integers.html
[factorial]: https://en.wikipedia.org/wiki/Factorial
[ieee754]: https://en.wikipedia.org/wiki/IEEE_754-1985