6615556556 has 24 divisors (see below), whose sum is σ = 13232894976. Its totient is φ = 2834856720.

The previous prime is 6615556501. The next prime is 6615556561. The reversal of 6615556556 is 6556555166.

It is a super-2 number, since 2×6615556556² = 87531177091269162272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320591 + ... + 340601.

It is an arithmetic number, because the mean of its divisors is an integer number (551370624).

Almost surely, 2^6615556556 is an apocalyptic number.

It is an amenable number.

6615556556 is an abundant number, since it is smaller than the sum of its proper divisors (6617338420).

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

6615556556 is a wasteful number, since it uses less digits than its factorization.

6615556556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31829 (or 31827 counting only the distinct ones).

The product of its digits is 4050000, while the sum is 50.

The square root of 6615556556 is about 81336.0716779462. The cubic root of 6615556556 is about 1877.2500685095.

The spelling of 6615556556 in words is "six billion, six hundred fifteen million, five hundred fifty-six thousand, five hundred fifty-six".