6640166860 has 24 divisors (see below), whose sum is σ = 14029905456. Its totient is φ = 2639770560.

The previous prime is 6640166857. The next prime is 6640166887. The reversal of 6640166860 is 686610466.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

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, 1015171 + ... + 1021690.

It is an arithmetic number, because the mean of its divisors is an integer number (584579394).

Almost surely, 2^6640166860 is an apocalyptic number.

It is an amenable number.

6640166860 is an abundant number, since it is smaller than the sum of its proper divisors (7389738596).

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

6640166860 is a wasteful number, since it uses less digits than its factorization.

6640166860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2037033 (or 2037031 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 43.

The square root of 6640166860 is about 81487.2189978281. The cubic root of 6640166860 is about 1879.5750189983.

The spelling of 6640166860 in words is "six billion, six hundred forty million, one hundred sixty-six thousand, eight hundred sixty".