557665856 has 56 divisors (see below), whose sum is σ = 1211945760. Its totient is φ = 252492800.

The previous prime is 557665847. The next prime is 557665861. The reversal of 557665856 is 658566755.

It is a junction number, because it is equal to n+sod(n) for n = 557665798 and 557665807.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196415 + ... + 199233.

Almost surely, 2^557665856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 557665856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (605972880).

557665856 is an abundant number, since it is smaller than the sum of its proper divisors (654279904).

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

557665856 is a wasteful number, since it uses less digits than its factorization.

557665856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3123 (or 3113 counting only the distinct ones).

The product of its digits is 7560000, while the sum is 53.

The square root of 557665856 is about 23614.9498411494. The cubic root of 557665856 is about 823.1102659511.

The spelling of 557665856 in words is "five hundred fifty-seven million, six hundred sixty-five thousand, eight hundred fifty-six".