CCrmPerms::IsAdmin

static function IsAdmin($userID = 0)
{
	if(!is_int($userID))
	{
		$userID = is_numeric($userID) ? (int)$userID : 0;
	}
	if($userID <= 0)
	{
		$userID = null;
	}

	return \Bitrix\Crm\Service\Container::getInstance()->getUserPermissions($userID)->isAdmin();
}