2556531003656 has 16 divisors (see below), whose sum is σ = 5478280722240. Its totient is φ = 1095656144400.

The previous prime is 2556531003629. The next prime is 2556531003661. The reversal of 2556531003656 is 6563001356552.

It is a self number, because there is not a number n which added to its sum of digits gives 2556531003656.

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 3 ways as a sum of consecutive naturals, for example, 22826169620 + ... + 22826169731.

It is an arithmetic number, because the mean of its divisors is an integer number (342392545140).

Almost surely, 2^{2556531003656} is an apocalyptic number.

It is an amenable number.

2556531003656 is an abundant number, since it is smaller than the sum of its proper divisors (2921749718584).

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

2556531003656 is a wasteful number, since it uses less digits than its factorization.

2556531003656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45652339364 (or 45652339360 counting only the distinct ones).

The product of its (nonzero) digits is 2430000, while the sum is 47.

The spelling of 2556531003656 in words is "two trillion, five hundred fifty-six billion, five hundred thirty-one million, three thousand, six hundred fifty-six".