U+4FFFF

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U+4FFFF is not a valid unicode character.
Encodings
HTML Entity (decimal) 
HTML Entity (hex) 
How to type in Microsoft Windows Alt +4FFFF
UTF-8 (hex) 0xF1 0x8F 0xBF 0xBF (f18fbfbf)
UTF-8 (binary) 11110001:10001111:10111111:10111111
UTF-16 (hex) 0xD8FF 0xDFFF (d8ffdfff)
UTF-16 (decimal) 55,551 57,343
UTF-32 (hex) 0x0004FFFF (4ffff)
UTF-32 (decimal) 327,679
C/C++/Java source code "\uD8FF\uDFFF"
Python source code u"\U0004FFFF"
More...
Java Data
string.toUpperCase() ��
string.toLowerCase() ��
Character.UnicodeBlock (none)
Character.charCount() 2
Character.getDirectionality() DIRECTIONALITY_UNDEFINED [-1]
Character.getNumericValue() -1
Character.getType() 0
Character.isDefined() No
Character.isDigit() No
Character.isIdentifierIgnorable() No
Character.isISOControl() No
Character.isJavaIdentifierPart() No
Character.isJavaIdentifierStart() No
Character.isLetter() No
Character.isLetterOrDigit() No
Character.isLowerCase() No
Character.isMirrored() No
Character.isSpaceChar() No
Character.isSupplementaryCodePoint() Yes
Character.isTitleCase() No
Character.isUnicodeIdentifierPart() No
Character.isUnicodeIdentifierStart() No
Character.isUpperCase() No
Character.isValidCodePoint() Yes
Character.isWhitespace() No