866027720668 has 24 divisors (see below), whose sum is σ = 1661981819904. Its totient is φ = 391587970800.

The previous prime is 866027720651. The next prime is 866027720711.

866027720668 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×866027720668² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51516330 + ... + 51533137.

It is an arithmetic number, because the mean of its divisors is an integer number (69249242496).

Almost surely, 2^866027720668 is an apocalyptic number.

It is an amenable number.

866027720668 is a deficient number, since it is larger than the sum of its proper divisors (795954099236).

866027720668 is a wasteful number, since it uses less digits than its factorization.

866027720668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103049673 (or 103049671 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 58.

The spelling of 866027720668 in words is "eight hundred sixty-six billion, twenty-seven million, seven hundred twenty thousand, six hundred sixty-eight".