866786278586442 has 64 divisors (see below), whose sum is σ = 1843847099251200. Its totient is φ = 270869742964800.

The previous prime is 866786278586441. The next prime is 866786278586497. The reversal of 866786278586442 is 244685872687668.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (866786278586441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2219109 + ... + 41695287.

It is an arithmetic number, because the mean of its divisors is an integer number (28810110925800).

Almost surely, 2^{866786278586442} is an apocalyptic number.

866786278586442 is an abundant number, since it is smaller than the sum of its proper divisors (977060820664758).

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

866786278586442 is a wasteful number, since it uses less digits than its factorization.

866786278586442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39478211.

The product of its digits is 83235962880, while the sum is 87.

The spelling of 866786278586442 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred seventy-eight million, five hundred eighty-six thousand, four hundred forty-two".