657857255056 has 75 divisors (see below), whose sum is σ = 1323356692515. Its totient is φ = 316809410400.

The previous prime is 657857255051. The next prime is 657857255063. The reversal of 657857255056 is 650552758756.

The square root of 657857255056 is 811084.

It is a perfect power (a square), and thus also a powerful number.

It is a junction number, because it is equal to n+sod(n) for n = 657857254985 and 657857255003.

It is not an unprimeable number, because it can be changed into a prime (657857255051) 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 in 14 ways as a sum of consecutive naturals, for example, 3117806791 + ... + 3117807001.

Almost surely, 2^657857255056 is an apocalyptic number.

657857255056 is the 811084-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 657857255056

657857255056 is an abundant number, since it is smaller than the sum of its proper divisors (665499437459).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

657857255056 is an frugal number, since it uses more digits than its factorization.

657857255056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 88200000, while the sum is 61.

The spelling of 657857255056 in words is "six hundred fifty-seven billion, eight hundred fifty-seven million, two hundred fifty-five thousand, fifty-six".