2556356556 has 48 divisors (see below), whose sum is σ = 6444442368. Its totient is φ = 784027200.

The previous prime is 2556356549. The next prime is 2556356557. The reversal of 2556356556 is 6556536552.

It is a super-2 number, since 2×2556356556² = 13069917682808362272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2556356557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22171 + ... + 74861.

It is an arithmetic number, because the mean of its divisors is an integer number (134259216).

Almost surely, 2^2556356556 is an apocalyptic number.

2556356556 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2556356556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3222221184).

2556356556 is an abundant number, since it is smaller than the sum of its proper divisors (3888085812).

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

2556356556 is a wasteful number, since it uses less digits than its factorization.

2556356556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53022 (or 53020 counting only the distinct ones).

The product of its digits is 4050000, while the sum is 48.

The square root of 2556356556 is about 50560.4248004306. The cubic root of 2556356556 is about 1367.3314698838.

The spelling of 2556356556 in words is "two billion, five hundred fifty-six million, three hundred fifty-six thousand, five hundred fifty-six".