258555978256 has 45 divisors (see below), whose sum is σ = 523774484751. Its totient is φ = 123634833696.

The previous prime is 258555978229. The next prime is 258555978301. The reversal of 258555978256 is 652879555852.

The square root of 258555978256 is 508484.

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

258555978256 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 258555978191 and 258555978200.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 46777765 + ... + 46783291.

Almost surely, 2^258555978256 is an apocalyptic number.

258555978256 is the 508484-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 258555978256

258555978256 is an abundant number, since it is smaller than the sum of its proper divisors (265218506495).

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

258555978256 is an frugal number, since it uses more digits than its factorization.

258555978256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11108 (or 5552 counting only the distinct ones).

The product of its digits is 302400000, while the sum is 67.

The spelling of 258555978256 in words is "two hundred fifty-eight billion, five hundred fifty-five million, nine hundred seventy-eight thousand, two hundred fifty-six".