Get ALL post types in WordPress in query_posts

'post_type' => 'any',

This gets all posts except revisions. https://developer.wordpress.org/reference/classes/wp_query/#post-type-parameters

So your query would be:

query_posts(array(
    'post_type' => 'any',
    'meta_key' => 'post_views_count',
    'orderby' => 'meta_value_num',
    'order' => 'DESC',
        'post_type' => array('posttype1', 'postype2', 'posttype3')
    )
);

You can use 'post_type' => 'any' for fetching from all post types. See this documentation. http://codex.wordpress.org/Class_Reference/WP_Query#Type_Parameters

Note: It is highly recommended to use WP_Query rather than query_posts. https://wordpress.stackexchange.com/a/1755/27998