866786278583832 has 32 divisors (see below), whose sum is σ = 2178193498007280. Its totient is φ = 287431719321600.

The previous prime is 866786278583689. The next prime is 866786278583833. The reversal of 866786278583832 is 238385872687668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866786278583833) 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, 93565008169 + ... + 93565017432.

Almost surely, 2^{866786278583832} is an apocalyptic number.

It is an amenable number.

866786278583832 is an abundant number, since it is smaller than the sum of its proper divisors (1311407219423448).

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

866786278583832 is a wasteful number, since it uses less digits than its factorization.

866786278583832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187130025803 (or 187130025799 counting only the distinct ones).

The product of its digits is 62426972160, while the sum is 87.

The spelling of 866786278583832 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred seventy-eight million, five hundred eighty-three thousand, eight hundred thirty-two".