866718930816 has 192 divisors, whose sum is σ = 2584995098400. Its totient is φ = 278517657600.

The previous prime is 866718930767. The next prime is 866718930839. The reversal of 866718930816 is 618039817668.

866718930816 is a `hidden beast` number, since 86 + 67 + 189 + 308 + 16 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

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 23 ways as a sum of consecutive naturals, for example, 4552741 + ... + 4739291.

Almost surely, 2^866718930816 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 866718930816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1292497549200).

866718930816 is an abundant number, since it is smaller than the sum of its proper divisors (1718276167584).

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

866718930816 is a wasteful number, since it uses less digits than its factorization.

866718930816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186717 (or 186702 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 63.

The spelling of 866718930816 in words is "eight hundred sixty-six billion, seven hundred eighteen million, nine hundred thirty thousand, eight hundred sixteen".