Number.MAX_VALUE
The Number.MAX_VALUE property represents the maximum numeric value representable in JavaScript.
Property attributes of Number.MAX_VALUE | 
    |
|---|---|
| Writable | no | 
| Enumerable | no | 
| Configurable | no | 
Description
The MAX_VALUE property has a value of approximately 1.79E+308, or 1.7976931348623157 * (10^308). Values larger than MAX_VALUE are represented as Infinity.
Because MAX_VALUE is a static property of Number, you always use it as Number.MAX_VALUE, rather than as a property of a Number object you created.
Examples
Using MAX_VALUE
The following code multiplies two numeric values. If the result is less than or equal to MAX_VALUE, the func1 function is called; otherwise, the func2 function is called.
if (num1 * num2 <= Number.MAX_VALUE) {
  func1();
} else {
  func2();
}
Specifications
| Specification | 
|---|
| ECMAScript Language Specification  # sec-number.max_value  | 
Browser compatibility
BCD tables only load in the browser
See also
Number.MIN_VALUE- The 
Numberobject it belongs to