diff --git a/snippets/mongocompat/mongotypes.js b/snippets/mongocompat/mongotypes.js
index 9a659a8..32539d9 100644
--- a/snippets/mongocompat/mongotypes.js
+++ b/snippets/mongocompat/mongotypes.js
@@ -378,10 +378,57 @@ if (!NumberLong.prototype) {
     NumberLong.prototype = {};
 }
 
+NumberLong.prototype.nativeToString = NumberLong.prototype.toString;
+NumberLong.prototype.toString = function () {
+    const INT32_MIN = -2147483648;
+    const INT32_MAX = 2147483647;
+
+    const numValue = this.toNumber ? this.toNumber() : Number(this);
+    if (numValue >= INT32_MIN && numValue <= INT32_MAX && Number.isInteger(numValue)) {
+        return `NumberLong(${numValue})`;
+    }
+    return `NumberLong("${this.exactValueString}")`;
+};
+
 NumberLong.prototype.tojson = function() {
     return this.toString();
 };
 
+Object.defineProperty(NumberLong.prototype, 'floatApprox', {
+    enumerable: false,
+    configurable: true,
+    get: function() {
+        return this.toNumber ? this.toNumber() : Number(this);
+    }
+});
+
+Object.defineProperty(NumberLong.prototype, 'top', {
+    enumerable: false,
+    configurable: true,
+    get: function() {
+        return this.high;
+    }
+});
+
+Object.defineProperty(NumberLong.prototype, 'bottom', {
+    enumerable: false,
+    configurable: true,
+    get: function() {
+        return this.low;
+    }
+});
+
+Object.defineProperty(NumberLong.prototype, 'exactValueString', {
+    enumerable: false,
+    configurable: true,
+    get: function() {
+        const high = BigInt(this.high);
+        const low = BigInt(this.low >>> 0);
+        const value = (high << 32n) | low;
+        return value.toString();
+    }
+});
+
 // NumberInt
 if (!NumberInt.prototype) {
     NumberInt.prototype = {};
diff --git a/snippets/mongocompat/test.js b/snippets/mongocompat/test.js
index 6913ae0..66e15f7 100644
--- a/snippets/mongocompat/test.js
+++ b/snippets/mongocompat/test.js
@@ -1,4 +1,24 @@
 load(__dirname + '/index.js');
 
 assert.strictEqual(ObjectId('0123456789abcdef01234567').tojson(), 'ObjectId("0123456789abcdef01234567")');
+
 assert.strictEqual(BinData(4, 'abcdefgh').toString(), 'BinData(4,"abcdefgh")');
+
+assert.strictEqual(NumberLong(2147483647).toString(), 'NumberLong(2147483647)');
+assert.strictEqual(NumberLong("2147483648").toString(), 'NumberLong("2147483648")');
+assert.strictEqual(NumberLong(-2147483648).toString(), 'NumberLong(-2147483648)');
+assert.strictEqual(NumberLong(-2147483649).toString(), 'NumberLong("-2147483649")');
+assert.strictEqual(NumberLong(9223372036854775807).toString(), 'NumberLong("9223372036854775807")');
+assert.strictEqual(NumberLong(-9223372036854775808).toString(), 'NumberLong("-9223372036854775808")');
+const maxLong = NumberLong(9223372036854775807, 2147483647, -1);
+assert.strictEqual(maxLong.floatApprox, 9223372036854775807);
+assert.strictEqual(maxLong.top, 2147483647);
+assert.strictEqual(maxLong.bottom, -1);//mongosh uses signed representation, while old shell uses unsigned
+assert.strictEqual(maxLong.exactValueString, "9223372036854775807");
+const minLong = NumberLong(-9223372036854775808);
+assert.strictEqual(minLong.floatApprox, -9223372036854776000);
+assert.strictEqual(minLong.top, -2147483648);
+assert.strictEqual(minLong.bottom, 0);
+assert.strictEqual(minLong.exactValueString, "-9223372036854775808");
+const nl2 = NumberLong("200");
+assert.strictEqual(maxLong.compare(nl2), 1);