2556521004 has 24 divisors (see below), whose sum is σ = 5969037760. Its totient is φ = 851627664.

The previous prime is 2556520999. The next prime is 2556521017. The reversal of 2556521004 is 4001256552.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48514 + ... + 86409.

Almost surely, 2^2556521004 is an apocalyptic number.

It is an amenable number.

2556521004 is an abundant number, since it is smaller than the sum of its proper divisors (3412516756).

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

2556521004 is a wasteful number, since it uses less digits than its factorization.

2556521004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136509 (or 136507 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 2556521004 is about 50562.0510264368. The cubic root of 2556521004 is about 1367.3607889687.

Adding to 2556521004 its reverse (4001256552), we get a palindrome (6557777556).

The spelling of 2556521004 in words is "two billion, five hundred fifty-six million, five hundred twenty-one thousand, four".