just make an alert as below in the config.js file, it gives the value
alert(CKEDITOR.version);
or you can see it directly in the file ckeditor_php4.php, for eg:
var $version = '3.6.3';
working demo :
alert(CKEDITOR.version);
console.log("CKEDITOR.version ==",CKEDITOR.version);
<head>
<meta charset="utf-8">
<title>CKEditor</title>
<script src="https://cdn.ckeditor.com/4.11.4/standard/ckeditor.js"></script>
</head>
<body>
<textarea id="editor1"></textarea>
<script>
CKEDITOR.replace( 'editor1' );
</script>
</body>
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