2506865856 has 56 divisors (see below), whose sum is σ = 7235732544. Its totient is φ = 759655680.

The previous prime is 2506865843. The next prime is 2506865857. The reversal of 2506865856 is 6585686052.

2506865856 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×2506865856² = 12568752839957225472, which contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 2506865799 and 2506865808.

It is not an unprimeable number, because it can be changed into a prime (2506865857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 591370 + ... + 595593.

Almost surely, 2^2506865856 is an apocalyptic number.

It is an amenable number.

2506865856 is an abundant number, since it is smaller than the sum of its proper divisors (4728866688).

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

2506865856 is a wasteful number, since it uses less digits than its factorization.

2506865856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186989 (or 1186979 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 51.

The square root of 2506865856 is about 50068.6114846418. The cubic root of 2506865856 is about 1358.4501259942.

The spelling of 2506865856 in words is "two billion, five hundred six million, eight hundred sixty-five thousand, eight hundred fifty-six".