2556775872 has 168 divisors, whose sum is σ = 8570829696. Its totient is φ = 713470464.

The previous prime is 2556775861. The next prime is 2556775883. The reversal of 2556775872 is 2785776552.

2556775872 is a `hidden beast` number, since 2 + 5 + 56 + 7 + 7 + 587 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (2556775861) and next prime (2556775883).

It is a tau number, because it is divible by the number of its divisors (168).

It is a congruent number.

It is an unprimeable number.

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, 166003 + ... + 180749.

Almost surely, 2^2556775872 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 2556775872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4285414848).

2556775872 is an abundant number, since it is smaller than the sum of its proper divisors (6014053824).

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

2556775872 is a wasteful number, since it uses less digits than its factorization.

2556775872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14815 (or 14802 counting only the distinct ones).

The product of its digits is 8232000, while the sum is 54.

The square root of 2556775872 is about 50564.5713123329. The cubic root of 2556775872 is about 1367.4062263591.

The spelling of 2556775872 in words is "two billion, five hundred fifty-six million, seven hundred seventy-five thousand, eight hundred seventy-two".