257409128807 has 2 divisors, whose sum is σ = 257409128808. Its totient is φ = 257409128806.

The previous prime is 257409128791. The next prime is 257409128833. The reversal of 257409128807 is 708821904752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257409128807 - 2⁴ = 257409128791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257409121807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128704564403 + 128704564404.

It is an arithmetic number, because the mean of its divisors is an integer number (128704564404).

Almost surely, 2^257409128807 is an apocalyptic number.

257409128807 is a deficient number, since it is larger than the sum of its proper divisors (1).

257409128807 is an equidigital number, since it uses as much as digits as its factorization.

257409128807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2257920, while the sum is 53.

The spelling of 257409128807 in words is "two hundred fifty-seven billion, four hundred nine million, one hundred twenty-eight thousand, eight hundred seven".