257268691825 has 6 divisors (see below), whose sum is σ = 319013177894. Its totient is φ = 205814953440.

The previous prime is 257268691817. The next prime is 257268691847. The reversal of 257268691825 is 528196862752.

It can be written as a sum of positive squares in 3 ways, for example, as 5349020769 + 251919671056 = 73137^2 + 501916^2 .

It is not a de Polignac number, because 257268691825 - 2³ = 257268691817 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5145373812 + ... + 5145373861.

Almost surely, 2^257268691825 is an apocalyptic number.

257268691825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

257268691825 is a deficient number, since it is larger than the sum of its proper divisors (61744486069).

257268691825 is a wasteful number, since it uses less digits than its factorization.

257268691825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10290747683 (or 10290747678 counting only the distinct ones).

The product of its digits is 29030400, while the sum is 61.

The spelling of 257268691825 in words is "two hundred fifty-seven billion, two hundred sixty-eight million, six hundred ninety-one thousand, eight hundred twenty-five".