257686047587 has 2 divisors, whose sum is σ = 257686047588. Its totient is φ = 257686047586.

The previous prime is 257686047569. The next prime is 257686047637. The reversal of 257686047587 is 785740686752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257686047587 - 2¹⁴ = 257686031203 is a prime.

It is not a weakly prime, because it can be changed into another prime (257686047517) 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, 128843023793 + 128843023794.

It is an arithmetic number, because the mean of its divisors is an integer number (128843023794).

Almost surely, 2^257686047587 is an apocalyptic number.

257686047587 is a deficient number, since it is larger than the sum of its proper divisors (1).

257686047587 is an equidigital number, since it uses as much as digits as its factorization.

257686047587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 158054400, while the sum is 65.

The spelling of 257686047587 in words is "two hundred fifty-seven billion, six hundred eighty-six million, forty-seven thousand, five hundred eighty-seven".