505455723281 has 2 divisors, whose sum is σ = 505455723282. Its totient is φ = 505455723280.

The previous prime is 505455723209. The next prime is 505455723313. The reversal of 505455723281 is 182327554505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 447367011025 + 58088712256 = 668855^2 + 241016^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505455723281 is a prime.

It is a super-2 number, since 2×505455723281² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (505455723781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252727861640 + 252727861641.

It is an arithmetic number, because the mean of its divisors is an integer number (252727861641).

Almost surely, 2^505455723281 is an apocalyptic number.

It is an amenable number.

505455723281 is a deficient number, since it is larger than the sum of its proper divisors (1).

505455723281 is an equidigital number, since it uses as much as digits as its factorization.

505455723281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680000, while the sum is 47.

The spelling of 505455723281 in words is "five hundred five billion, four hundred fifty-five million, seven hundred twenty-three thousand, two hundred eighty-one".