$100,000,000,000 because such a coin doesn't exist.
Silver was only used in US nickels from 1942-1945 on coins with a large mintmark over the Monticello.
A 1957 nickel is a common coin, worth a dollar or so if completely uncirculated but only really 5 cents if circulated.
A 1957 nickel is worth face value only, unless it's uncirculated or a proof coin.
The only years silver was used in US nickels was 1942-1945, the coin is face value.
All silver certificates printed from 1928 to 1957 had blue seals. Please see the question "What is the value of a 1957 A US 1 dollar silver certificate?" for more information.
Your nickel contains no silver. Only nickels made from 1942-1945 contain silver. See the related question below.
If you found it in change your nickel is only worth face value. US nickels made from 1866 to mid-1942 and from 1946 to the present are made of a copper-nickel alloy, not silver. In fact, no circulating US coins have contained any silver since 1969.
That's a silver war nickel, containing 35% silver, and it's worth at least $2.
Please don't assume that because a coin is older it must be made of silver. Britain eliminated silver in most of its coins long before 1957; yours is made of copper-nickel like modern US coins.Please see the Related Question for more information.
There was no silver dollar in the US made in 1957. It might be a half dollar. These are usually worth about $10-15.
Copper-nickel, not silver. The only nickels that ever contained any silver were the famous "war nickels" made from 1942 to 1945, when silver replaced nickel metal because nickel was needed for the war effort.
The only US nickels to contain silver are those minted during WWII. A 1959 nickel in uncirculated condition might go for 25 cents.
The 1949 Jefferson nickel is still found in circulation, contains no silver and likely only face value.
That is known as a "war nickel" to save nickel for the war effort, the US government replaced some of the nickel in the nickel with silver. At the time of writing the silver content in them is around $1.70. The reason for the mintmark over the Monticello was that the idea was that people would know they contained silver.