2556804644 has 6 divisors (see below), whose sum is σ = 4474408134. Its totient is φ = 1278402320.

The previous prime is 2556804619. The next prime is 2556804647. The reversal of 2556804644 is 4464086552.

It can be written as a sum of positive squares in only one way, i.e., 1708830244 + 847974400 = 41338^2 + 29120^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2556804595 and 2556804604.

It is not an unprimeable number, because it can be changed into a prime (2556804647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319600577 + ... + 319600584.

It is an arithmetic number, because the mean of its divisors is an integer number (745734689).

Almost surely, 2^2556804644 is an apocalyptic number.

It is an amenable number.

2556804644 is a deficient number, since it is larger than the sum of its proper divisors (1917603490).

2556804644 is a wasteful number, since it uses less digits than its factorization.

2556804644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639201165 (or 639201163 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 44.

The square root of 2556804644 is about 50564.8558190370. The cubic root of 2556804644 is about 1367.4113555878.

The spelling of 2556804644 in words is "two billion, five hundred fifty-six million, eight hundred four thousand, six hundred forty-four".