2556843783556 has 24 divisors (see below), whose sum is σ = 4478851563480. Its totient is φ = 1277172494592.

The previous prime is 2556843783547. The next prime is 2556843783581. The reversal of 2556843783556 is 6553873486552.

It can be written as a sum of positive squares in 4 ways, for example, as 1011098625156 + 1545745158400 = 1005534^2 + 1243280^2 .

It is a super-2 number, since 2×2556843783556² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2556843783491 and 2556843783500.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17907360 + ... + 18049576.

It is an arithmetic number, because the mean of its divisors is an integer number (186618815145).

Almost surely, 2^{2556843783556} is an apocalyptic number.

It is an amenable number.

2556843783556 is a deficient number, since it is larger than the sum of its proper divisors (1922007779924).

2556843783556 is a wasteful number, since it uses less digits than its factorization.

2556843783556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146583 (or 146581 counting only the distinct ones).

The product of its digits is 725760000, while the sum is 67.

The spelling of 2556843783556 in words is "two trillion, five hundred fifty-six billion, eight hundred forty-three million, seven hundred eighty-three thousand, five hundred fifty-six".