Laravel将bigint插入MySQL错误

这是我的表结构

SET NAMES utf8;
SET foreign_key_checks = 0;
SET time_zone = '+07:00';
SET sql_mode = 'NO_AUTO_VALUE_ON_ZERO';
DROP TABLE IF EXISTS `merchants`;
CREATE TABLE `merchants` (
`id` bigint(20) NOT NULL,
`name` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`url` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`address` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`work_hour` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`created_at` datetime NOT NULL,
`updated_at` datetime NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

我的模型

<?php
namespace App;
use IlluminateDatabaseEloquentModel;
/**
* @property $name
* Class Merchant
* @package App
*/
class Merchant extends Model
{
/**
 * The table associated with the model
 * @var string
 */
protected $table = "merchants";
//
protected $fillable = [
    "name", "url", "address", "work_hour", "id"
];
public $incrementing = false;
}

echo php_int_size;//8echo php_int_max;//9223372036854775807

每次，我都会用ID插入新记录是一个bigint，在DB

中总是错误的

$merchant->id = $newId1;
$merchant->name = $request->name;
$merchant->url = $request->url;
$merchant->address = $request->address;
$merchant->work_hour = 'a';
$merchant->created_at = date('Y-m-d h:i:s');
$merchant->updated_at = date('Y-m-d h:i:s');
$merchant->save();

$ newid1 = 4550103638072627879;但是它显示在MySQL -2144066090

中

请帮助

$merchant->id = (string) $newId1;