255355433871817 has 2 divisors, whose sum is σ = 255355433871818. Its totient is φ = 255355433871816.

The previous prime is 255355433871781. The next prime is 255355433871943. The reversal of 255355433871817 is 718178334553552.

Together with previous prime (255355433871781) 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., 255270152934976 + 85280936841 = 15977176^2 + 292029^2 .

It is a cyclic number.

It is not a de Polignac number, because 255355433871817 - 2⁷ = 255355433871689 is a prime.

It is not a weakly prime, because it can be changed into another prime (255355433874817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127677716935908 + 127677716935909.

It is an arithmetic number, because the mean of its divisors is an integer number (127677716935909).

Almost surely, 2^{255355433871817} is an apocalyptic number.

It is an amenable number.

255355433871817 is a deficient number, since it is larger than the sum of its proper divisors (1).

255355433871817 is an equidigital number, since it uses as much as digits as its factorization.

255355433871817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360000, while the sum is 67.

The spelling of 255355433871817 in words is "two hundred fifty-five trillion, three hundred fifty-five billion, four hundred thirty-three million, eight hundred seventy-one thousand, eight hundred seventeen".