diff --git a/src/PhpSpreadsheet/Cell/DefaultValueBinder.php b/src/PhpSpreadsheet/Cell/DefaultValueBinder.php
index 10c5c93c59..f636befcfb 100644
--- a/src/PhpSpreadsheet/Cell/DefaultValueBinder.php
+++ b/src/PhpSpreadsheet/Cell/DefaultValueBinder.php
@@ -2,6 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Cell;
 
+use Composer\Pcre\Preg;
 use DateTimeInterface;
 use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
 use PhpOffice\PhpSpreadsheet\Calculation\Exception as CalculationException;
@@ -12,6 +13,9 @@
 
 class DefaultValueBinder implements IValueBinder
 {
+    //                            123 456 789 012 345
+    private const FIFTEEN_NINES = 999_999_999_999_999;
+
     /**
      * Bind value to a cell.
      *
@@ -49,6 +53,9 @@ public static function dataTypeForValue(mixed $value): string
         if ($value === null) {
             return DataType::TYPE_NULL;
         }
+        if (is_int($value) && abs($value) > self::FIFTEEN_NINES) {
+            return DataType::TYPE_STRING;
+        }
         if (is_float($value) || is_int($value)) {
             return DataType::TYPE_NUMERIC;
         }
@@ -89,13 +96,18 @@ public static function dataTypeForValue(mixed $value): string
 
             return DataType::TYPE_FORMULA;
         }
-        if (preg_match('/^[\+\-]?(\d+\.?\d*|\d*\.?\d+)([Ee][\-\+]?[0-2]?\d{1,3})?$/', $value)) {
+        if (Preg::isMatch('/^[\+\-]?(\d+\.?\d*|\d*\.?\d+)([Ee][\-\+]?[0-2]?\d{1,3})?$/', $value)) {
             $tValue = ltrim($value, '+-');
             if (strlen($tValue) > 1 && $tValue[0] === '0' && $tValue[1] !== '.') {
                 return DataType::TYPE_STRING;
-            } elseif ((!str_contains($value, '.')) && ($value > PHP_INT_MAX)) {
-                return DataType::TYPE_STRING;
-            } elseif (!is_numeric($value)) {
+            }
+            if (!Preg::isMatch('/[eE.]/', $value)) {
+                $aValue = abs((float) $value);
+                if ($aValue > self::FIFTEEN_NINES) {
+                    return DataType::TYPE_STRING;
+                }
+            }
+            if (!is_numeric($value)) {
                 return DataType::TYPE_STRING;
             }
 
diff --git a/tests/PhpSpreadsheetTests/Writer/Xlsx/FloatsRetainedTest.php b/tests/PhpSpreadsheetTests/Writer/Xlsx/FloatsRetainedTest.php
index c10a1b9b47..fa9205154c 100644
--- a/tests/PhpSpreadsheetTests/Writer/Xlsx/FloatsRetainedTest.php
+++ b/tests/PhpSpreadsheetTests/Writer/Xlsx/FloatsRetainedTest.php
@@ -8,16 +8,21 @@
 use PhpOffice\PhpSpreadsheet\Shared\File;
 use PhpOffice\PhpSpreadsheet\Spreadsheet;
 use PhpOffice\PhpSpreadsheet\Writer\Xlsx as Writer;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class FloatsRetainedTest extends TestCase
 {
-    #[\PHPUnit\Framework\Attributes\DataProvider('providerIntyFloatsRetainedByWriter')]
-    public function testIntyFloatsRetainedByWriter(float|int $value): void
+    #[DataProvider('providerIntyFloatsRetainedByWriter')]
+    public function testIntyFloatsRetainedByWriter(float|int $value, mixed $expected = null): void
     {
+        if ($expected === null) {
+            $expected = $value;
+        }
         $outputFilename = File::temporaryFilename();
         $spreadsheet = new Spreadsheet();
-        $spreadsheet->getActiveSheet()->getCell('A1')->setValue($value);
+        $spreadsheet->getActiveSheet()
+            ->getCell('A1')->setValue($value);
 
         $writer = new Writer($spreadsheet);
         $writer->save($outputFilename);
@@ -27,7 +32,11 @@ public function testIntyFloatsRetainedByWriter(float|int $value): void
         $spreadsheet2 = $reader->load($outputFilename);
         unlink($outputFilename);
 
-        self::assertSame($value, $spreadsheet2->getActiveSheet()->getCell('A1')->getValue());
+        self::assertSame(
+            $expected,
+            $spreadsheet2->getActiveSheet()
+                ->getCell('A1')->getValue()
+        );
         $spreadsheet2->disconnectWorksheets();
     }
 
@@ -44,10 +53,10 @@ public static function providerIntyFloatsRetainedByWriter(): array
             [1.3e-10],
             [1e10],
             [3.00000000000000000001],
-            [99999999999999999],
-            [99999999999999999.0],
-            [999999999999999999999999999999999999999999],
-            [999999999999999999999999999999999999999999.0],
+            'int but too much precision for Excel' => [99_999_999_999_999_999, '99999999999999999'],
+            [99_999_999_999_999_999.0],
+            'int > PHP_INT_MAX so stored as float' => [999_999_999_999_999_999_999_999_999_999_999_999_999_999],
+            [999_999_999_999_999_999_999_999_999_999_999_999_999_999.0],
         ];
     }
 }