257125657556 has 12 divisors (see below), whose sum is σ = 449974252980. Its totient is φ = 128561585280.

The previous prime is 257125657501. The next prime is 257125657567. The reversal of 257125657556 is 655756521752.

It can be written as a sum of positive squares in 2 ways, for example, as 110811757456 + 146313900100 = 332884^2 + 382510^2 .

It is a super-2 number, since 2×257125657556² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278540 + ... + 769308.

It is an arithmetic number, because the mean of its divisors is an integer number (37497854415).

Almost surely, 2^257125657556 is an apocalyptic number.

It is an amenable number.

257125657556 is a deficient number, since it is larger than the sum of its proper divisors (192848595424).

257125657556 is a wasteful number, since it uses less digits than its factorization.

257125657556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621754 (or 621752 counting only the distinct ones).

The product of its digits is 22050000, while the sum is 56.

The spelling of 257125657556 in words is "two hundred fifty-seven billion, one hundred twenty-five million, six hundred fifty-seven thousand, five hundred fifty-six".