2556317808 has 120 divisors (see below), whose sum is σ = 7892642160. Its totient is φ = 765895680.

The previous prime is 2556317791. The next prime is 2556317809. The reversal of 2556317808 is 8087136552.

2556317808 is a `hidden beast` number, since 2 + 5 + 5 + 631 + 7 + 8 + 0 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556317809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 131910 + ... + 150042.

It is an arithmetic number, because the mean of its divisors is an integer number (65772018).

Almost surely, 2^2556317808 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 2556317808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3946321080).

2556317808 is an abundant number, since it is smaller than the sum of its proper divisors (5336324352).

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

2556317808 is a wasteful number, since it uses less digits than its factorization.

2556317808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18247 (or 18238 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The square root of 2556317808 is about 50560.0416139069. The cubic root of 2556317808 is about 1367.3245614021.

The spelling of 2556317808 in words is "two billion, five hundred fifty-six million, three hundred seventeen thousand, eight hundred eight".