diff --git a/superset-frontend/plugins/plugin-chart-echarts/src/BigNumber/BigNumberTotal/transformProps.test.ts b/superset-frontend/plugins/plugin-chart-echarts/src/BigNumber/BigNumberTotal/transformProps.test.ts
index c4868ac61e7..00522b9d0a8 100644
--- a/superset-frontend/plugins/plugin-chart-echarts/src/BigNumber/BigNumberTotal/transformProps.test.ts
+++ b/superset-frontend/plugins/plugin-chart-echarts/src/BigNumber/BigNumberTotal/transformProps.test.ts
@@ -231,6 +231,56 @@ describe('BigNumberTotal transformProps', () => {
     expect(result.headerFormatter(500)).toBe('$500');
   });
 
+  test('should pass through non-numeric raw string when parseMetricValue returns null (e.g. VARCHAR MAX)', () => {
+    const { parseMetricValue } = jest.requireMock('../utils');
+    parseMetricValue.mockReturnValueOnce(null);
+
+    const chartProps = {
+      width: 400,
+      height: 300,
+      queriesData: [
+        {
+          data: [{ value: 'some-varchar-result' }],
+          coltypes: [GenericDataType.String],
+        },
+      ],
+      formData: baseFormData,
+      rawFormData: baseRawFormData,
+      hooks: baseHooks,
+      datasource: baseDatasource,
+    };
+
+    const result = transformProps(
+      chartProps as unknown as BigNumberTotalChartProps,
+    );
+    expect(result.bigNumber).toBe('some-varchar-result');
+  });
+
+  test('should pass through numeric-looking VARCHAR string literally (e.g. "123")', () => {
+    const { parseMetricValue } = jest.requireMock('../utils');
+    parseMetricValue.mockReturnValueOnce(null);
+
+    const chartProps = {
+      width: 400,
+      height: 300,
+      queriesData: [
+        {
+          data: [{ value: '123' }],
+          coltypes: [GenericDataType.String],
+        },
+      ],
+      formData: baseFormData,
+      rawFormData: baseRawFormData,
+      hooks: baseHooks,
+      datasource: baseDatasource,
+    };
+
+    const result = transformProps(
+      chartProps as unknown as BigNumberTotalChartProps,
+    );
+    expect(result.bigNumber).toBe('123');
+  });
+
   test('should propagate colorThresholdFormatters from getColorFormatters', () => {
     // Override the getColorFormatters mock to return specific value
     const mockFormatters = [{ formatter: 'red' }];
diff --git a/superset-frontend/plugins/plugin-chart-echarts/src/BigNumber/BigNumberTotal/transformProps.ts b/superset-frontend/plugins/plugin-chart-echarts/src/BigNumber/BigNumberTotal/transformProps.ts
index 7c250595962..3c7c78ecc70 100644
--- a/superset-frontend/plugins/plugin-chart-echarts/src/BigNumber/BigNumberTotal/transformProps.ts
+++ b/superset-frontend/plugins/plugin-chart-echarts/src/BigNumber/BigNumberTotal/transformProps.ts
@@ -79,8 +79,15 @@ export default function transformProps(
   const formattedSubtitleFontSize = subtitle?.trim()
     ? (subtitleFontSize ?? PROPORTION.SUBHEADER)
     : (subheaderFontSize ?? subtitleFontSize ?? PROPORTION.SUBHEADER);
+  const rawValue = data.length === 0 ? null : data[0][metricName];
+  const parsedValue = rawValue == null ? null : parseMetricValue(rawValue);
+
   const bigNumber =
-    data.length === 0 ? null : parseMetricValue(data[0][metricName]);
+    parsedValue === null &&
+    typeof rawValue === 'string' &&
+    rawValue.trim() !== ''
+      ? rawValue
+      : parsedValue;
 
   let metricEntry: Metric | undefined;
   if (chartProps.datasource?.metrics) {
diff --git a/superset-frontend/plugins/plugin-chart-echarts/src/BigNumber/BigNumberViz.tsx b/superset-frontend/plugins/plugin-chart-echarts/src/BigNumber/BigNumberViz.tsx
index 9f5a9d0ccda..25c2774d825 100644
--- a/superset-frontend/plugins/plugin-chart-echarts/src/BigNumber/BigNumberViz.tsx
+++ b/superset-frontend/plugins/plugin-chart-echarts/src/BigNumber/BigNumberViz.tsx
@@ -189,8 +189,10 @@ function BigNumberVis({
       text = t('No data');
     } else if (typeof bigNumber === 'number') {
       text = headerFormatter(bigNumber);
+    } else if (typeof bigNumber === 'string') {
+      text = bigNumber;
     } else {
-      // For string/boolean/Date values, convert to number if possible, else show as string
+      // For boolean/Date values, convert to number if possible, else show as string
       const numValue = Number(bigNumber);
       text = Number.isNaN(numValue)
         ? String(bigNumber)