257039028857 has 4 divisors (see below), whose sum is σ = 276811261860. Its totient is φ = 237266795856.

The previous prime is 257039028839. The next prime is 257039028863. The reversal of 257039028857 is 758820930752.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 100587928336 + 156451100521 = 317156^2 + 395539^2 .

It is a cyclic number.

It is not a de Polignac number, because 257039028857 - 2⁶ = 257039028793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257039028457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9886116482 + ... + 9886116507.

It is an arithmetic number, because the mean of its divisors is an integer number (69202815465).

Almost surely, 2^257039028857 is an apocalyptic number.

It is an amenable number.

257039028857 is a deficient number, since it is larger than the sum of its proper divisors (19772233003).

257039028857 is a wasteful number, since it uses less digits than its factorization.

257039028857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19772233002.

The product of its (nonzero) digits is 8467200, while the sum is 56.

The spelling of 257039028857 in words is "two hundred fifty-seven billion, thirty-nine million, twenty-eight thousand, eight hundred fifty-seven".