866668887 has 12 divisors (see below), whose sum is σ = 1430691600. Its totient is φ = 495239328.

The previous prime is 866668867. The next prime is 866668889. The reversal of 866668887 is 788866668.

866668887 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 866668887 - 2¹⁰ = 866667863 is a prime.

It is a super-2 number, since 2×866668887² = 1502229919387637538, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 13756649 = 866668887 / (8 + 6 + 6 + 6 + 6 + 8 + 8 + 8 + 7).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866668889) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6878262 + ... + 6878387.

It is an arithmetic number, because the mean of its divisors is an integer number (119224300).

Almost surely, 2^866668887 is an apocalyptic number.

866668887 is a deficient number, since it is larger than the sum of its proper divisors (564022713).

866668887 is a wasteful number, since it uses less digits than its factorization.

866668887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13756662 (or 13756659 counting only the distinct ones).

The product of its digits is 37158912, while the sum is 63.

The square root of 866668887 is about 29439.2405982220. The cubic root of 866668887 is about 953.4203161895.

The spelling of 866668887 in words is "eight hundred sixty-six million, six hundred sixty-eight thousand, eight hundred eighty-seven".