diff --git a/eos/core/bigint/js.py b/eos/core/bigint/js.py
index 9d04477..1ebbe92 100644
--- a/eos/core/bigint/js.py
+++ b/eos/core/bigint/js.py
@@ -33,7 +33,7 @@ lib = __pragma__('js', '''
 }})()''', __include__('eos/core/bigint/jsbn.js'), __include__('eos/core/bigint/jsbn2.js'))
 
 class BigInt(EosObject):
-	def __init__(self, a, b=None):
+	def __init__(self, a, b=10):
 		if isinstance(a, str):
 			self.impl = lib.nbi()
 			self.impl.fromString(a, b)
diff --git a/eos/core/bigint/python.py b/eos/core/bigint/python.py
index 181520a..356d050 100644
--- a/eos/core/bigint/python.py
+++ b/eos/core/bigint/python.py
@@ -16,5 +16,29 @@
 
 from eos.core.objects import EosObject
 
-class BigInt(int, EosObject):
-	pass
+class BigInt(EosObject):
+	def __init__(self, a, b=10):
+		self.impl = int(a, b) if isinstance(a, str) else int(a)
+	
+	def __pow__(self, other, modulo=None):
+		if not isinstance(other, BigInt):
+			other = BigInt(other)
+		if modulo is None:
+			return BigInt(self.impl.__pow__(other.impl))
+		if not isinstance(modulo, BigInt):
+			modulo = BigInt(modulo)
+		return BigInt(self.impl.__pow__(other.impl, modulo.impl))
+
+for func in [
+	'__add__', '__sub__', '__mul__', '__mod__', '__or__', '__lshift__', '__xor__',
+	'__eq__', '__ne__', '__lt__', '__gt__', '__le__', '__ge__',
+	'__str__'
+]:
+	def make_operator_func(func_):
+		# Create a closure
+		def operator_func(self, other):
+			if not isinstance(other, BigInt):
+				other = BigInt(other)
+			return BigInt(getattr(self.impl, func_)(other.impl))
+		return operator_func
+	setattr(BigInt, func, make_operator_func(func))