257252386406387 has 2 divisors, whose sum is σ = 257252386406388. Its totient is φ = 257252386406386.

The previous prime is 257252386406371. The next prime is 257252386406413. The reversal of 257252386406387 is 783604683252752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257252386406387 - 2⁴ = 257252386406371 is a prime.

It is not a weakly prime, because it can be changed into another prime (257252386406087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128626193203193 + 128626193203194.

It is an arithmetic number, because the mean of its divisors is an integer number (128626193203194).

Almost surely, 2^{257252386406387} is an apocalyptic number.

257252386406387 is a deficient number, since it is larger than the sum of its proper divisors (1).

257252386406387 is an equidigital number, since it uses as much as digits as its factorization.

257252386406387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 812851200, while the sum is 68.

The spelling of 257252386406387 in words is "two hundred fifty-seven trillion, two hundred fifty-two billion, three hundred eighty-six million, four hundred six thousand, three hundred eighty-seven".