255645515017 has 2 divisors, whose sum is σ = 255645515018. Its totient is φ = 255645515016.

The previous prime is 255645515003. The next prime is 255645515051. The reversal of 255645515017 is 710515546552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254478882681 + 1166632336 = 504459^2 + 34156^2 .

It is a cyclic number.

It is not a de Polignac number, because 255645515017 - 2¹⁹ = 255644990729 is a prime.

It is not a weakly prime, because it can be changed into another prime (255645515087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127822757508 + 127822757509.

It is an arithmetic number, because the mean of its divisors is an integer number (127822757509).

Almost surely, 2^255645515017 is an apocalyptic number.

It is an amenable number.

255645515017 is a deficient number, since it is larger than the sum of its proper divisors (1).

255645515017 is an equidigital number, since it uses as much as digits as its factorization.

255645515017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1050000, while the sum is 46.

The spelling of 255645515017 in words is "two hundred fifty-five billion, six hundred forty-five million, five hundred fifteen thousand, seventeen".