257775857 has 2 divisors, whose sum is σ = 257775858. Its totient is φ = 257775856.

The previous prime is 257775829. The next prime is 257775863. The reversal of 257775857 is 758577752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223681936 + 34093921 = 14956^2 + 5839^2 .

It is a cyclic number.

It is not a de Polignac number, because 257775857 - 2¹⁰ = 257774833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 257775799 and 257775808.

It is not a weakly prime, because it can be changed into another prime (257775827) 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, 128887928 + 128887929.

It is an arithmetic number, because the mean of its divisors is an integer number (128887929).

Almost surely, 2^257775857 is an apocalyptic number.

It is an amenable number.

257775857 is a deficient number, since it is larger than the sum of its proper divisors (1).

257775857 is an equidigital number, since it uses as much as digits as its factorization.

257775857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4802000, while the sum is 53.

The square root of 257775857 is about 16055.3996213112. The cubic root of 257775857 is about 636.4252665524.

The spelling of 257775857 in words is "two hundred fifty-seven million, seven hundred seventy-five thousand, eight hundred fifty-seven".