866866695036 has 12 divisors (see below), whose sum is σ = 2022688955112. Its totient is φ = 288955565008.

The previous prime is 866866694999. The next prime is 866866695049. The reversal of 866866695036 is 630596668668.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 36119445615 + ... + 36119445638.

It is an arithmetic number, because the mean of its divisors is an integer number (168557412926).

Almost surely, 2^866866695036 is an apocalyptic number.

It is an amenable number.

866866695036 is an abundant number, since it is smaller than the sum of its proper divisors (1155822260076).

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

866866695036 is a wasteful number, since it uses less digits than its factorization.

866866695036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72238891260 (or 72238891258 counting only the distinct ones).

The product of its (nonzero) digits is 403107840, while the sum is 69.

The spelling of 866866695036 in words is "eight hundred sixty-six billion, eight hundred sixty-six million, six hundred ninety-five thousand, thirty-six".