6638125556 has 24 divisors (see below), whose sum is σ = 11862433800. Its totient is φ = 3249139712.

The previous prime is 6638125547. The next prime is 6638125579. The reversal of 6638125556 is 6555218366.

It can be written as a sum of positive squares in 4 ways, for example, as 1893120100 + 4745005456 = 43510^2 + 68884^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6638125556.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60320 + ... + 130056.

It is an arithmetic number, because the mean of its divisors is an integer number (494268075).

Almost surely, 2^6638125556 is an apocalyptic number.

It is an amenable number.

6638125556 is a deficient number, since it is larger than the sum of its proper divisors (5224308244).

6638125556 is a wasteful number, since it uses less digits than its factorization.

6638125556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70243 (or 70241 counting only the distinct ones).

The product of its digits is 1296000, while the sum is 47.

The square root of 6638125556 is about 81474.6927333881. The cubic root of 6638125556 is about 1879.3823944595.

The spelling of 6638125556 in words is "six billion, six hundred thirty-eight million, one hundred twenty-five thousand, five hundred fifty-six".