505226643156281 has 2 divisors, whose sum is σ = 505226643156282. Its totient is φ = 505226643156280.

The previous prime is 505226643156217. The next prime is 505226643156289. The reversal of 505226643156281 is 182651346622505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 466452870150400 + 38773773005881 = 21597520^2 + 6226859^2 .

It is a cyclic number.

It is not a de Polignac number, because 505226643156281 - 2⁶ = 505226643156217 is a prime.

It is a super-2 number, since 2×505226643156281² (a number of 30 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (505226643156289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252613321578140 + 252613321578141.

It is an arithmetic number, because the mean of its divisors is an integer number (252613321578141).

Almost surely, 2^{505226643156281} is an apocalyptic number.

It is an amenable number.

505226643156281 is a deficient number, since it is larger than the sum of its proper divisors (1).

505226643156281 is an equidigital number, since it uses as much as digits as its factorization.

505226643156281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736000, while the sum is 56.

Adding to 505226643156281 its reverse (182651346622505), we get a palindrome (687877989778786).

The spelling of 505226643156281 in words is "five hundred five trillion, two hundred twenty-six billion, six hundred forty-three million, one hundred fifty-six thousand, two hundred eighty-one".