257565163 has 2 divisors, whose sum is σ = 257565164. Its totient is φ = 257565162.

The previous prime is 257565131. The next prime is 257565179. The reversal of 257565163 is 361565752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257565163 - 2⁵ = 257565131 is a prime.

It is not a weakly prime, because it can be changed into another prime (257565563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128782581 + 128782582.

It is an arithmetic number, because the mean of its divisors is an integer number (128782582).

Almost surely, 2^257565163 is an apocalyptic number.

257565163 is a deficient number, since it is larger than the sum of its proper divisors (1).

257565163 is an equidigital number, since it uses as much as digits as its factorization.

257565163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 189000, while the sum is 40.

The square root of 257565163 is about 16048.8368114328. The cubic root of 257565163 is about 636.2518244821.

The spelling of 257565163 in words is "two hundred fifty-seven million, five hundred sixty-five thousand, one hundred sixty-three".