866800082636856 has 64 divisors (see below), whose sum is σ = 2407780689235200. Its totient is φ = 288933039049824.

The previous prime is 866800082636797. The next prime is 866800082636857. The reversal of 866800082636856 is 658636280008668.

866800082636856 is a `hidden beast` number, since 8 + 66 + 80 + 0 + 0 + 82 + 6 + 368 + 56 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866800082636857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267091725 + ... + 270317571.

It is an arithmetic number, because the mean of its divisors is an integer number (37621573269300).

Almost surely, 2^{866800082636856} is an apocalyptic number.

It is an amenable number.

866800082636856 is an abundant number, since it is smaller than the sum of its proper divisors (1540980606598344).

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

866800082636856 is a wasteful number, since it uses less digits than its factorization.

866800082636856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4469865 (or 4469855 counting only the distinct ones).

The product of its (nonzero) digits is 955514880, while the sum is 72.

The spelling of 866800082636856 in words is "eight hundred sixty-six trillion, eight hundred billion, eighty-two million, six hundred thirty-six thousand, eight hundred fifty-six".