6686179988 has 12 divisors (see below), whose sum is σ = 11892632052. Its totient is φ = 3288285120.

The previous prime is 6686179957. The next prime is 6686179991. The reversal of 6686179988 is 8899716866.

It can be written as a sum of positive squares in 2 ways, for example, as 550277764 + 6135902224 = 23458^2 + 78332^2 .

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 13700945 + ... + 13701432.

It is an arithmetic number, because the mean of its divisors is an integer number (991052671).

Almost surely, 2^6686179988 is an apocalyptic number.

It is an amenable number.

6686179988 is a deficient number, since it is larger than the sum of its proper divisors (5206452064).

6686179988 is a wasteful number, since it uses less digits than its factorization.

6686179988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27402442 (or 27402440 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 68.

The square root of 6686179988 is about 81769.0649818133. The cubic root of 6686179988 is about 1883.9065429214.

The spelling of 6686179988 in words is "six billion, six hundred eighty-six million, one hundred seventy-nine thousand, nine hundred eighty-eight".