646166810568 has 128 divisors (see below), whose sum is σ = 1644985036800. Its totient is φ = 211482130176.

The previous prime is 646166810543. The next prime is 646166810573. The reversal of 646166810568 is 865018661646.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 442882623 + ... + 442884081.

It is an arithmetic number, because the mean of its divisors is an integer number (12851445600).

Almost surely, 2^646166810568 is an apocalyptic number.

It is an amenable number.

646166810568 is an abundant number, since it is smaller than the sum of its proper divisors (998818226232).

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

646166810568 is a wasteful number, since it uses less digits than its factorization.

646166810568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2771 (or 2767 counting only the distinct ones).

The product of its (nonzero) digits is 9953280, while the sum is 57.

The spelling of 646166810568 in words is "six hundred forty-six billion, one hundred sixty-six million, eight hundred ten thousand, five hundred sixty-eight".