2556620044 has 24 divisors (see below), whose sum is σ = 4960838736. Its totient is φ = 1143048000.

The previous prime is 2556620029. The next prime is 2556620047. The reversal of 2556620044 is 4400266552.

It is a junction number, because it is equal to n+sod(n) for n = 2556619991 and 2556620009.

It is not an unprimeable number, because it can be changed into a prime (2556620047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 473587 + ... + 478954.

It is an arithmetic number, because the mean of its divisors is an integer number (206701614).

Almost surely, 2^2556620044 is an apocalyptic number.

It is an amenable number.

2556620044 is a deficient number, since it is larger than the sum of its proper divisors (2404218692).

2556620044 is a wasteful number, since it uses less digits than its factorization.

2556620044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952617 (or 952615 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 34.

The square root of 2556620044 is about 50563.0304076012. The cubic root of 2556620044 is about 1367.3784459934.

Adding to 2556620044 its reverse (4400266552), we get a palindrome (6956886596).

The spelling of 2556620044 in words is "two billion, five hundred fifty-six million, six hundred twenty thousand, forty-four".