2556843783555 has 16 divisors (see below), whose sum is σ = 4177991545344. Its totient is φ = 1334636187360.

The previous prime is 2556843783547. The next prime is 2556843783581. The reversal of 2556843783555 is 5553873486552.

It is a happy number.

It is not a de Polignac number, because 2556843783555 - 2³ = 2556843783547 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1813363681 + ... + 1813365090.

It is an arithmetic number, because the mean of its divisors is an integer number (261124471584).

Almost surely, 2^{2556843783555} is an apocalyptic number.

2556843783555 is a deficient number, since it is larger than the sum of its proper divisors (1621147761789).

2556843783555 is a wasteful number, since it uses less digits than its factorization.

2556843783555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3626728826.

The product of its digits is 604800000, while the sum is 66.

The spelling of 2556843783555 in words is "two trillion, five hundred fifty-six billion, eight hundred forty-three million, seven hundred eighty-three thousand, five hundred fifty-five".