255021651317 has 2 divisors, whose sum is σ = 255021651318. Its totient is φ = 255021651316.

The previous prime is 255021651281. The next prime is 255021651329. The reversal of 255021651317 is 713156120552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164544620881 + 90477030436 = 405641^2 + 300794^2 .

It is a cyclic number.

It is not a de Polignac number, because 255021651317 - 2²⁴ = 255004874101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255021651917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127510825658 + 127510825659.

It is an arithmetic number, because the mean of its divisors is an integer number (127510825659).

Almost surely, 2^255021651317 is an apocalyptic number.

It is an amenable number.

255021651317 is a deficient number, since it is larger than the sum of its proper divisors (1).

255021651317 is an equidigital number, since it uses as much as digits as its factorization.

255021651317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63000, while the sum is 38.

Adding to 255021651317 its reverse (713156120552), we get a palindrome (968177771869).

The spelling of 255021651317 in words is "two hundred fifty-five billion, twenty-one million, six hundred fifty-one thousand, three hundred seventeen".