257636473 has 2 divisors, whose sum is σ = 257636474. Its totient is φ = 257636472.

The previous prime is 257636461. The next prime is 257636527. The reversal of 257636473 is 374636752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 241740304 + 15896169 = 15548^2 + 3987^2 .

It is a cyclic number.

It is not a de Polignac number, because 257636473 - 2¹³ = 257628281 is a prime.

It is not a weakly prime, because it can be changed into another prime (257636573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128818236 + 128818237.

It is an arithmetic number, because the mean of its divisors is an integer number (128818237).

Almost surely, 2^257636473 is an apocalyptic number.

It is an amenable number.

257636473 is a deficient number, since it is larger than the sum of its proper divisors (1).

257636473 is an equidigital number, since it uses as much as digits as its factorization.

257636473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 43.

The square root of 257636473 is about 16051.0583140178. The cubic root of 257636473 is about 636.3105370431.

The spelling of 257636473 in words is "two hundred fifty-seven million, six hundred thirty-six thousand, four hundred seventy-three".