2556488881 has 4 divisors (see below), whose sum is σ = 2644643700. Its totient is φ = 2468334064.

The previous prime is 2556488861. The next prime is 2556488887. The reversal of 2556488881 is 1888846552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1745150625 + 811338256 = 41775^2 + 28484^2 .

It is a cyclic number.

It is not a de Polignac number, because 2556488881 - 2⁹ = 2556488369 is a prime.

It is a super-2 number, since 2×2556488881² = 13071270797353264322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2556488887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44077366 + ... + 44077423.

It is an arithmetic number, because the mean of its divisors is an integer number (661160925).

Almost surely, 2^2556488881 is an apocalyptic number.

It is an amenable number.

2556488881 is a deficient number, since it is larger than the sum of its proper divisors (88154819).

2556488881 is an equidigital number, since it uses as much as digits as its factorization.

2556488881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88154818.

The product of its digits is 4915200, while the sum is 55.

The square root of 2556488881 is about 50561.7333662524. The cubic root of 2556488881 is about 1367.3550619260.

The spelling of 2556488881 in words is "two billion, five hundred fifty-six million, four hundred eighty-eight thousand, eight hundred eighty-one".