255442343055217 has 2 divisors, whose sum is σ = 255442343055218. Its totient is φ = 255442343055216.

The previous prime is 255442343055187. The next prime is 255442343055271. The reversal of 255442343055217 is 712550343244552.

Together with next prime (255442343055271) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152926637055201 + 102515706000016 = 12366351^2 + 10125004^2 .

It is a cyclic number.

It is not a de Polignac number, because 255442343055217 - 2¹⁹ = 255442342530929 is a prime.

It is not a weakly prime, because it can be changed into another prime (255442343055917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127721171527608 + 127721171527609.

It is an arithmetic number, because the mean of its divisors is an integer number (127721171527609).

Almost surely, 2^{255442343055217} is an apocalyptic number.

It is an amenable number.

255442343055217 is a deficient number, since it is larger than the sum of its proper divisors (1).

255442343055217 is an equidigital number, since it uses as much as digits as its factorization.

255442343055217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160000, while the sum is 52.

Adding to 255442343055217 its reverse (712550343244552), we get a palindrome (967992686299769).

The spelling of 255442343055217 in words is "two hundred fifty-five trillion, four hundred forty-two billion, three hundred forty-three million, fifty-five thousand, two hundred seventeen".