257278688027 has 4 divisors (see below), whose sum is σ = 265578000576. Its totient is φ = 248979375480.

The previous prime is 257278687979. The next prime is 257278688083. The reversal of 257278688027 is 720886872752.

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

It is a cyclic number.

It is not a de Polignac number, because 257278688027 - 2²⁸ = 257010252571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257278688087) 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, 4149656228 + ... + 4149656289.

It is an arithmetic number, because the mean of its divisors is an integer number (66394500144).

Almost surely, 2^257278688027 is an apocalyptic number.

257278688027 is a deficient number, since it is larger than the sum of its proper divisors (8299312549).

257278688027 is an equidigital number, since it uses as much as digits as its factorization.

257278688027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8299312548.

The product of its (nonzero) digits is 42147840, while the sum is 62.

The spelling of 257278688027 in words is "two hundred fifty-seven billion, two hundred seventy-eight million, six hundred eighty-eight thousand, twenty-seven".