JSFiddle - React, Tailwind, and code Playground

HTML

<div id="test"></div>
<div id="check"></div>
<div id="max"></div>

JavaScript

var a = 870744036720833075;
document.getElementById('test').innerHTML = a;

document.getElementById('check').innerHTML = Number.isSafeInteger(a)

document.getElementById('max').innerHTML = Number.MAX_SAFE_INTEGER