866686680680 has 32 divisors (see below), whose sum is σ = 1950483939840. Its totient is φ = 346596644160.

The previous prime is 866686680649. The next prime is 866686680707. The reversal of 866686680680 is 86086686668.

866686680680 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×866686680680² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 866686680680.

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, 2258276 + ... + 2614035.

It is an arithmetic number, because the mean of its divisors is an integer number (60952623120).

Almost surely, 2^866686680680 is an apocalyptic number.

It is an amenable number.

866686680680 is an abundant number, since it is smaller than the sum of its proper divisors (1083797259160).

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

866686680680 is a wasteful number, since it uses less digits than its factorization.

866686680680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4876769 (or 4876765 counting only the distinct ones).

The product of its (nonzero) digits is 191102976, while the sum is 68.

The spelling of 866686680680 in words is "eight hundred sixty-six billion, six hundred eighty-six million, six hundred eighty thousand, six hundred eighty".