866786278583706 has 192 divisors, whose sum is σ = 2107546569676800. Its totient is φ = 235149017773824.

The previous prime is 866786278583689. The next prime is 866786278583833. The reversal of 866786278583706 is 607385872687668.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 37376155 + ... + 55951313.

It is an arithmetic number, because the mean of its divisors is an integer number (10976805050400).

Almost surely, 2^{866786278583706} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866786278583706, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1053773284838400).

866786278583706 is an abundant number, since it is smaller than the sum of its proper divisors (1240760291093094).

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

866786278583706 is a wasteful number, since it uses less digits than its factorization.

866786278583706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18575293 (or 18575256 counting only the distinct ones).

The product of its (nonzero) digits is 54623600640, while the sum is 87.

The spelling of 866786278583706 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred seventy-eight million, five hundred eighty-three thousand, seven hundred six".