6660320868 has 36 divisors (see below), whose sum is σ = 17111813628. Its totient is φ = 2183711040.

The previous prime is 6660320839. The next prime is 6660320881. The reversal of 6660320868 is 8680230666.

It can be written as a sum of positive squares in 2 ways, for example, as 952216164 + 5708104704 = 30858^2 + 75552^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1514271 + ... + 1518662.

Almost surely, 2^6660320868 is an apocalyptic number.

It is an amenable number.

6660320868 is an abundant number, since it is smaller than the sum of its proper divisors (10451492760).

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

6660320868 is a wasteful number, since it uses less digits than its factorization.

6660320868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3033004 (or 3032999 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The square root of 6660320868 is about 81610.7889191129. The cubic root of 6660320868 is about 1881.4747056704.

The spelling of 6660320868 in words is "six billion, six hundred sixty million, three hundred twenty thousand, eight hundred sixty-eight".