257978119909 has 2 divisors, whose sum is σ = 257978119910. Its totient is φ = 257978119908.

The previous prime is 257978119879. The next prime is 257978119999. The reversal of 257978119909 is 909911879752.

257978119909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221285568100 + 36692551809 = 470410^2 + 191553^2 .

It is a cyclic number.

It is not a de Polignac number, because 257978119909 - 2⁷ = 257978119781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257978119999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128989059954 + 128989059955.

It is an arithmetic number, because the mean of its divisors is an integer number (128989059955).

Almost surely, 2^257978119909 is an apocalyptic number.

It is an amenable number.

257978119909 is a deficient number, since it is larger than the sum of its proper divisors (1).

257978119909 is an equidigital number, since it uses as much as digits as its factorization.

257978119909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25719120, while the sum is 67.

The spelling of 257978119909 in words is "two hundred fifty-seven billion, nine hundred seventy-eight million, one hundred nineteen thousand, nine hundred nine".