257309341789 has 2 divisors, whose sum is σ = 257309341790. Its totient is φ = 257309341788.

The previous prime is 257309341781. The next prime is 257309341811. The reversal of 257309341789 is 987143903752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135740664900 + 121568676889 = 368430^2 + 348667^2 .

It is a cyclic number.

It is not a de Polignac number, because 257309341789 - 2³ = 257309341781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257309341781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128654670894 + 128654670895.

It is an arithmetic number, because the mean of its divisors is an integer number (128654670895).

Almost surely, 2^257309341789 is an apocalyptic number.

It is an amenable number.

257309341789 is a deficient number, since it is larger than the sum of its proper divisors (1).

257309341789 is an equidigital number, since it uses as much as digits as its factorization.

257309341789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11430720, while the sum is 58.

The spelling of 257309341789 in words is "two hundred fifty-seven billion, three hundred nine million, three hundred forty-one thousand, seven hundred eighty-nine".