diff --git a/generators/builtins/unsignedTypes.kt b/generators/builtins/unsignedTypes.kt
index 42f3a4ead02..a8dcb204e87 100644
--- a/generators/builtins/unsignedTypes.kt
+++ b/generators/builtins/unsignedTypes.kt
@@ -69,6 +69,8 @@ class UnsignedTypeGenerator(val type: UnsignedType, out: PrintWriter) : BuiltIns
 
         generateMemberConversions()
 
+        generateToStringHashCode()
+
         out.println("}")
         out.println()
 
@@ -203,6 +205,20 @@ class UnsignedTypeGenerator(val type: UnsignedType, out: PrintWriter) : BuiltIns
     }
 
 
+    private fun generateToStringHashCode() {
+
+        out.print("    public override fun toString(): String = ")
+        when (type) {
+            UnsignedType.UBYTE, UnsignedType.USHORT -> out.println("toInt().toString()")
+            UnsignedType.UINT -> out.println("toLong().toString()")
+            UnsignedType.ULONG -> out.println("ulongToString(data)")
+            else -> error(type)
+        }
+
+        out.println()
+    }
+
+
     private fun maxByDomainCapacity(type1: UnsignedType, type2: UnsignedType): UnsignedType =
         if (type1.ordinal > type2.ordinal) type1 else type2
 
diff --git a/libraries/stdlib/unsigned/src/kotlin/UByte.kt b/libraries/stdlib/unsigned/src/kotlin/UByte.kt
index 237d4f1deef..1f466993a92 100644
--- a/libraries/stdlib/unsigned/src/kotlin/UByte.kt
+++ b/libraries/stdlib/unsigned/src/kotlin/UByte.kt
@@ -123,6 +123,8 @@ public inline class UByte internal constructor(private val data: Byte) : Compara
     public fun toUInt(): UInt = data.toUInt()
     public fun toULong(): ULong = data.toULong()
 
+    public override fun toString(): String = toInt().toString()
+
 }
 
 public fun Byte.toUByte(): UByte = UByte(this)
diff --git a/libraries/stdlib/unsigned/src/kotlin/UInt.kt b/libraries/stdlib/unsigned/src/kotlin/UInt.kt
index 0cbf400b3c9..bb423b57996 100644
--- a/libraries/stdlib/unsigned/src/kotlin/UInt.kt
+++ b/libraries/stdlib/unsigned/src/kotlin/UInt.kt
@@ -127,6 +127,8 @@ public inline class UInt internal constructor(private val data: Int) : Comparabl
     public fun toUInt(): UInt = this
     public fun toULong(): ULong = data.toULong()
 
+    public override fun toString(): String = toLong().toString()
+
 }
 
 public fun Byte.toUInt(): UInt = UInt(this.toInt() and 0xFF)
diff --git a/libraries/stdlib/unsigned/src/kotlin/ULong.kt b/libraries/stdlib/unsigned/src/kotlin/ULong.kt
index 612b46a56bc..6b7b0c3fa0f 100644
--- a/libraries/stdlib/unsigned/src/kotlin/ULong.kt
+++ b/libraries/stdlib/unsigned/src/kotlin/ULong.kt
@@ -127,6 +127,8 @@ public inline class ULong internal constructor(private val data: Long) : Compara
     public fun toUInt(): UInt = data.toUInt()
     public fun toULong(): ULong = this
 
+    public override fun toString(): String = ulongToString(data)
+
 }
 
 public fun Byte.toULong(): ULong = ULong(this.toLong() and 0xFF)
diff --git a/libraries/stdlib/unsigned/src/kotlin/UShort.kt b/libraries/stdlib/unsigned/src/kotlin/UShort.kt
index 59819cfd327..be63b42cc43 100644
--- a/libraries/stdlib/unsigned/src/kotlin/UShort.kt
+++ b/libraries/stdlib/unsigned/src/kotlin/UShort.kt
@@ -123,6 +123,8 @@ public inline class UShort internal constructor(private val data: Short) : Compa
     public fun toUInt(): UInt = data.toUInt()
     public fun toULong(): ULong = data.toULong()
 
+    public override fun toString(): String = toInt().toString()
+
 }
 
 public fun Byte.toUShort(): UShort = UShort(this.toShort() and 0xFF)
diff --git a/libraries/stdlib/unsigned/src/kotlin/UnsignedUtils.kt b/libraries/stdlib/unsigned/src/kotlin/UnsignedUtils.kt
index 46a152016ce..198ee51e78f 100644
--- a/libraries/stdlib/unsigned/src/kotlin/UnsignedUtils.kt
+++ b/libraries/stdlib/unsigned/src/kotlin/UnsignedUtils.kt
@@ -51,4 +51,21 @@ internal fun ulongRemainder(v1: ULong, v2: ULong): ULong {
     val quotient = ((dividend ushr 1) / divisor) shl 1
     val rem = dividend - quotient * divisor
     return ULong(rem - if (ULong(rem) >= ULong(divisor)) divisor else 0)
-}
\ No newline at end of file
+}
+
+
+internal fun ulongToString(v: Long): String = ulongToString(v, 10)
+
+internal fun ulongToString(v: Long, base: Int): String {
+    require(base == 10) // TODO: toString(base) support in common
+    if (v >= 0) return v.toString(/* base */)
+
+    var quotient = ((v ushr 1) / base) shl 1
+    var rem = v - quotient * base
+    if (rem >= base) {
+        rem -= base
+        quotient += 1
+    }
+    return quotient.toString(/* base */) + rem.toString(/* base */)
+}
+