diff --git a/SignificantNumber.Test/SignificantNumberRangeTests.cs b/SignificantNumber.Test/SignificantNumberRangeTests.cs
index f2864f9..423607b 100644
--- a/SignificantNumber.Test/SignificantNumberRangeTests.cs
+++ b/SignificantNumber.Test/SignificantNumberRangeTests.cs
@@ -56,6 +56,26 @@ public void Exp_ResultBelowDoubleRange_ReturnsNonzeroMagnitude()
 		Assert.AreEqual(Parse("5.07595889755E-435"), result);
 	}
 
+	[TestMethod]
+	[DataRow("2E308", "1")]
+	[DataRow("-1E400", "1")]
+	[DataRow("1E308", "1")]
+	[DataRow("-3E400", "1")]
+	public void Pow_NegativeOneToAnEvenIntegerBeyondDoubleRange_ReturnsOne(string power, string expected) =>
+		Assert.AreEqual(Parse(expected), SignificantNumber.NegativeOne.Pow(Precise(power)));
+
+	[TestMethod]
+	public void Pow_NegativeOneToAnOddIntegerBeyondDoubleRange_ReturnsNegativeOne()
+	{
+		PreciseNumber oddPower = Precise("2" + new string('0', 310) + "1");
+		Assert.AreEqual(SignificantNumber.NegativeOne, SignificantNumber.NegativeOne.Pow(oddPower));
+		Assert.AreEqual(SignificantNumber.NegativeOne, SignificantNumber.NegativeOne.Pow(PreciseNumber.Negate(oddPower)));
+	}
+
+	[TestMethod]
+	public void Pow_NegativeOneToANonIntegerPower_StillThrowsArgumentException() =>
+		Assert.ThrowsExactly<ArgumentException>(() => SignificantNumber.NegativeOne.Pow(Precise("0.5")));
+
 	[TestMethod]
 	public void Pow_PowerOfTenBeyondExponentRange_ThrowsOverflowException()
 	{
diff --git a/SignificantNumber/SignificantNumber.cs b/SignificantNumber/SignificantNumber.cs
index f879e51..9179e20 100644
--- a/SignificantNumber/SignificantNumber.cs
+++ b/SignificantNumber/SignificantNumber.cs
@@ -605,6 +605,11 @@ public SignificantNumber Pow(PreciseNumber power)
 		{
 			return One;
 		}
+		else if (Equal(this, NegativeOne) && PreciseNumber.IsInteger(power))
+		{
+			// (-1)^n is exact for any integer n, however far beyond the range of a double it is.
+			return PreciseNumber.IsEvenInteger(power) ? One : NegativeOne;
+		}
 
 		bool isNegativeBase = PreciseNumber.IsNegative(Value);
 		if (isNegativeBase && !PreciseNumber.IsInteger(power))