Since 1896, the company has used its "57 Varieties" slogan; it was inspired by a sign advertising 21 styles of shoes, and Henry Heinz chose the number 57 even though the company manufactured more than 60 products at the time.

This information might be interesting for you:

The H. J. Heinz Company, or Heinz, is an American food processing company with world headquarters in Pittsburgh, Pennsylvania. It was founded by Henry John Heinz in 1869. The H. J. Heinz Company manufactures thousands of food products in plants on six continents, and markets these products in more than 200 countries and territories. The company claims to have 150 number-one or number two-brands worldwide. Heinz ranked first in ketchup in the US with a market share in excess of 50%; Ore-Ida label held 46% of the frozen-potato sector in 2003.

More Info: en.wikipedia.org