866799609900 has 576 divisors, whose sum is σ = 3104441303040. Its totient is φ = 182304000000.

The previous prime is 866799609833. The next prime is 866799609911. The reversal of 866799609900 is 9906997668.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 410609845 + ... + 410611955.

It is an arithmetic number, because the mean of its divisors is an integer number (5389655040).

Almost surely, 2^866799609900 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 866799609900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1552220651520).

866799609900 is an abundant number, since it is smaller than the sum of its proper divisors (2237641693140).

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

866799609900 is a wasteful number, since it uses less digits than its factorization.

866799609900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2446 (or 2439 counting only the distinct ones).

The product of its (nonzero) digits is 79361856, while the sum is 69.

The spelling of 866799609900 in words is "eight hundred sixty-six billion, seven hundred ninety-nine million, six hundred nine thousand, nine hundred".