866916746856 has 192 divisors, whose sum is σ = 2538531964800. Its totient is φ = 266594904576.

The previous prime is 866916746851. The next prime is 866916746863. The reversal of 866916746856 is 658647619668.

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

It is not an unprimeable number, because it can be changed into a prime (866916746851) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5094606 + ... + 5262018.

It is an arithmetic number, because the mean of its divisors is an integer number (13221520650).

Almost surely, 2^866916746856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866916746856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1269265982400).

866916746856 is an abundant number, since it is smaller than the sum of its proper divisors (1671615217944).

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

866916746856 is a wasteful number, since it uses less digits than its factorization.

866916746856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167560 (or 167553 counting only the distinct ones).

The product of its digits is 627056640, while the sum is 72.

The spelling of 866916746856 in words is "eight hundred sixty-six billion, nine hundred sixteen million, seven hundred forty-six thousand, eight hundred fifty-six".