866808220668 has 48 divisors (see below), whose sum is σ = 2178192068640. Its totient is φ = 266703047424.

The previous prime is 866808220667. The next prime is 866808220697. The reversal of 866808220668 is 866022808668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866808220661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10784646 + ... + 10864722.

It is an arithmetic number, because the mean of its divisors is an integer number (45379001430).

Almost surely, 2^866808220668 is an apocalyptic number.

It is an amenable number.

866808220668 is an abundant number, since it is smaller than the sum of its proper divisors (1311383847972).

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

866808220668 is a wasteful number, since it uses less digits than its factorization.

866808220668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149486 (or 149484 counting only the distinct ones).

The product of its (nonzero) digits is 21233664, while the sum is 60.

The spelling of 866808220668 in words is "eight hundred sixty-six billion, eight hundred eight million, two hundred twenty thousand, six hundred sixty-eight".