255746717 has 2 divisors, whose sum is σ = 255746718. Its totient is φ = 255746716.

The previous prime is 255746681. The next prime is 255746719. The reversal of 255746717 is 717647552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 255648121 + 98596 = 15989^2 + 314^2 .

It is a cyclic number.

It is not a de Polignac number, because 255746717 - 2⁶ = 255746653 is a prime.

Together with 255746719, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255746719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127873358 + 127873359.

It is an arithmetic number, because the mean of its divisors is an integer number (127873359).

Almost surely, 2^255746717 is an apocalyptic number.

It is an amenable number.

255746717 is a deficient number, since it is larger than the sum of its proper divisors (1).

255746717 is an equidigital number, since it uses as much as digits as its factorization.

255746717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 411600, while the sum is 44.

The square root of 255746717 is about 15992.0829475087. The cubic root of 255746717 is about 634.7509445520.

The spelling of 255746717 in words is "two hundred fifty-five million, seven hundred forty-six thousand, seven hundred seventeen".