2556001556 has 12 divisors (see below), whose sum is σ = 4475973600. Its totient is φ = 1277151960.

The previous prime is 2556001549. The next prime is 2556001573. The reversal of 2556001556 is 6551006552.

It is a super-2 number, since 2×2556001556² = 13066287908548842272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205406 + ... + 217493.

It is an arithmetic number, because the mean of its divisors is an integer number (372997800).

Almost surely, 2^2556001556 is an apocalyptic number.

It is an amenable number.

2556001556 is a deficient number, since it is larger than the sum of its proper divisors (1919972044).

2556001556 is a wasteful number, since it uses less digits than its factorization.

2556001556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424414 (or 424412 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 35.

The square root of 2556001556 is about 50556.9140276580. The cubic root of 2556001556 is about 1367.2681734002.

The spelling of 2556001556 in words is "two billion, five hundred fifty-six million, one thousand, five hundred fifty-six".