6639659168 has 48 divisors (see below), whose sum is σ = 13500224640. Its totient is φ = 3212622336.

The previous prime is 6639659107. The next prime is 6639659177. The reversal of 6639659168 is 8619569366.

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, 109055 + ... + 158657.

It is an arithmetic number, because the mean of its divisors is an integer number (281254680).

Almost surely, 2^6639659168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6639659168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6750112320).

6639659168 is an abundant number, since it is smaller than the sum of its proper divisors (6860565472).

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

6639659168 is a wasteful number, since it uses less digits than its factorization.

6639659168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49749 (or 49741 counting only the distinct ones).

The product of its digits is 12597120, while the sum is 59.

The square root of 6639659168 is about 81484.1037749081. The cubic root of 6639659168 is about 1879.5271151057.

The spelling of 6639659168 in words is "six billion, six hundred thirty-nine million, six hundred fifty-nine thousand, one hundred sixty-eight".