255428812817 has 2 divisors, whose sum is σ = 255428812818. Its totient is φ = 255428812816.

The previous prime is 255428812789. The next prime is 255428812819. The reversal of 255428812817 is 718218824552.

255428812817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169510064656 + 85918748161 = 411716^2 + 293119^2 .

It is a cyclic number.

It is not a de Polignac number, because 255428812817 - 2²⁶ = 255361703953 is a prime.

Together with 255428812819, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (255428812819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127714406408 + 127714406409.

It is an arithmetic number, because the mean of its divisors is an integer number (127714406409).

Almost surely, 2^255428812817 is an apocalyptic number.

It is an amenable number.

255428812817 is a deficient number, since it is larger than the sum of its proper divisors (1).

255428812817 is an equidigital number, since it uses as much as digits as its factorization.

255428812817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2867200, while the sum is 53.

The spelling of 255428812817 in words is "two hundred fifty-five billion, four hundred twenty-eight million, eight hundred twelve thousand, eight hundred seventeen".