# FLOAT64_MAX_SAFE_INTEGER
> Maximum safe [double-precision floating-point][ieee754] integer.
## Usage
```javascript
var FLOAT64_MAX_SAFE_INTEGER = require( '@stdlib/constants/float64/max-safe-integer' );
```
#### FLOAT64_MAX_SAFE_INTEGER
The maximum [safe][safe-integers] [double-precision floating-point][ieee754] integer.
```javascript
var bool = ( FLOAT64_MAX_SAFE_INTEGER === 9007199254740991 );
// returns true
```
## Examples
```javascript
var randu = require( '@stdlib/random/base/randu' );
var round = require( '@stdlib/math/base/special/round' );
var pow = require( '@stdlib/math/base/special/pow' );
var FLOAT64_MAX_SAFE_INTEGER = require( '@stdlib/constants/float64/max-safe-integer' );
var max;
var x;
var i;
max = pow( 2.0, 55 );
for ( i = 0; i < 100; i++ ) {
x = round( randu() * max );
if ( x > FLOAT64_MAX_SAFE_INTEGER ) {
console.log( 'Unsafe: %d', x );
} else {
console.log( 'Safe: %d', x );
}
}
```
* * *
## C APIs
### Usage
```c
#include "stdlib/constants/float64/max_safe_integer.h"
```
#### STDLIB_CONSTANT_FLOAT64_MAX_SAFE_INTEGER
Macro for the maximum [safe][safe-integers] [double-precision floating-point][ieee754] integer.
[safe-integers]: http://www.2ality.com/2013/10/safe-integers.html
[ieee754]: https://en.wikipedia.org/wiki/IEEE_754-1985
[@stdlib/constants/float16/max-safe-integer]: https://github.com/stdlib-js/constants/tree/main/float16/max-safe-integer
[@stdlib/constants/float32/max-safe-integer]: https://github.com/stdlib-js/constants/tree/main/float32/max-safe-integer
[@stdlib/constants/float64/min-safe-integer]: https://github.com/stdlib-js/constants/tree/main/float64/min-safe-integer