206691640680 has 128 divisors (see below), whose sum is σ = 731517050880. Its totient is φ = 45719804160.

The previous prime is 206691640613. The next prime is 206691640691. The reversal of 206691640680 is 86046196602.

It is a happy number.

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, 3942694 + ... + 3994773.

It is an arithmetic number, because the mean of its divisors is an integer number (5714976960).

Almost surely, 2^206691640680 is an apocalyptic number.

206691640680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206691640680 is an abundant number, since it is smaller than the sum of its proper divisors (524825410200).

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

206691640680 is a wasteful number, since it uses less digits than its factorization.

206691640680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7937519 (or 7937515 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 48.

The spelling of 206691640680 in words is "two hundred six billion, six hundred ninety-one million, six hundred forty thousand, six hundred eighty".