866786278583688 has 32 divisors (see below), whose sum is σ = 2236867815701760. Its totient is φ = 279608476962240.

The previous prime is 866786278583629. The next prime is 866786278583689. The reversal of 866786278583688 is 886385872687668.

It is a junction number, because it is equal to n+sod(n) for n = 866786278583595 and 866786278583604.

It is not an unprimeable number, because it can be changed into a prime (866786278583689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 582517659595 + ... + 582517661082.

It is an arithmetic number, because the mean of its divisors is an integer number (69902119240680).

Almost surely, 2^{866786278583688} is an apocalyptic number.

It is an amenable number.

866786278583688 is an abundant number, since it is smaller than the sum of its proper divisors (1370081537118072).

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

866786278583688 is a wasteful number, since it uses less digits than its factorization.

866786278583688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1165035320717 (or 1165035320713 counting only the distinct ones).

The product of its digits is 499415777280, while the sum is 96.

The spelling of 866786278583688 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred seventy-eight million, five hundred eighty-three thousand, six hundred eighty-eight".