2556388616568 has 32 divisors (see below), whose sum is σ = 6391040208000. Its totient is φ = 852120383328.

The previous prime is 2556388616549. The next prime is 2556388616591. The reversal of 2556388616568 is 8656168836552.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1931655 + ... + 2973897.

It is an arithmetic number, because the mean of its divisors is an integer number (199720006500).

Almost surely, 2^{2556388616568} is an apocalyptic number.

It is an amenable number.

2556388616568 is an abundant number, since it is smaller than the sum of its proper divisors (3834651591432).

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

2556388616568 is a wasteful number, since it uses less digits than its factorization.

2556388616568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144451 (or 1144447 counting only the distinct ones).

The product of its digits is 497664000, while the sum is 69.

The spelling of 2556388616568 in words is "two trillion, five hundred fifty-six billion, three hundred eighty-eight million, six hundred sixteen thousand, five hundred sixty-eight".