257638463 has 2 divisors, whose sum is σ = 257638464. Its totient is φ = 257638462.

The previous prime is 257638429. The next prime is 257638529. The reversal of 257638463 is 364836752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257638463 - 2¹⁰ = 257637439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257638963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128819231 + 128819232.

It is an arithmetic number, because the mean of its divisors is an integer number (128819232).

Almost surely, 2^257638463 is an apocalyptic number.

257638463 is a deficient number, since it is larger than the sum of its proper divisors (1).

257638463 is an equidigital number, since it uses as much as digits as its factorization.

257638463 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 44.

The square root of 257638463 is about 16051.1203035801. The cubic root of 257638463 is about 636.3121753395.

The spelling of 257638463 in words is "two hundred fifty-seven million, six hundred thirty-eight thousand, four hundred sixty-three".