866786673089 has 4 divisors (see below), whose sum is σ = 866798494656. Its totient is φ = 866774851524.

The previous prime is 866786673083. The next prime is 866786673097. The reversal of 866786673089 is 980376687668.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866786673089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866786673083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5800109 + ... + 5947674.

It is an arithmetic number, because the mean of its divisors is an integer number (216699623664).

Almost surely, 2^866786673089 is an apocalyptic number.

It is an amenable number.

866786673089 is a deficient number, since it is larger than the sum of its proper divisors (11821567).

866786673089 is a wasteful number, since it uses less digits than its factorization.

866786673089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11821566.

The product of its (nonzero) digits is 877879296, while the sum is 74.

The spelling of 866786673089 in words is "eight hundred sixty-six billion, seven hundred eighty-six million, six hundred seventy-three thousand, eighty-nine".