6647166568 has 128 divisors (see below), whose sum is σ = 15600844800. Its totient is φ = 2590963200.

The previous prime is 6647166541. The next prime is 6647166593. The reversal of 6647166568 is 8656617466.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4518073 + ... + 4519543.

It is an arithmetic number, because the mean of its divisors is an integer number (121881600).

Almost surely, 2^6647166568 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 6647166568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7800422400).

6647166568 is an abundant number, since it is smaller than the sum of its proper divisors (8953678232).

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

6647166568 is a wasteful number, since it uses less digits than its factorization.

6647166568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1671 (or 1667 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 55.

The square root of 6647166568 is about 81530.1574142967. The cubic root of 6647166568 is about 1880.2352361449.

The spelling of 6647166568 in words is "six billion, six hundred forty-seven million, one hundred sixty-six thousand, five hundred sixty-eight".