6616656878 has 16 divisors (see below), whose sum is σ = 11057014080. Its totient is φ = 2948536416.

The previous prime is 6616656821. The next prime is 6616656883. The reversal of 6616656878 is 8786566166.

It is a happy number.

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, 4386950 + ... + 4388457.

It is an arithmetic number, because the mean of its divisors is an integer number (691063380).

Almost surely, 2^6616656878 is an apocalyptic number.

6616656878 is a deficient number, since it is larger than the sum of its proper divisors (4440357202).

6616656878 is a wasteful number, since it uses less digits than its factorization.

6616656878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8775451.

The product of its digits is 17418240, while the sum is 59.

The square root of 6616656878 is about 81342.8354435718. The cubic root of 6616656878 is about 1877.3541396246.

The spelling of 6616656878 in words is "six billion, six hundred sixteen million, six hundred fifty-six thousand, eight hundred seventy-eight".