866686668 has 24 divisors (see below), whose sum is σ = 2076925872. Its totient is φ = 281087424.

The previous prime is 866686657. The next prime is 866686669.

866686668 is nontrivially palindromic in base 10.

866686668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×866686668² = 1502291560977884448, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (866686669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 975555 + ... + 976442.

It is an arithmetic number, because the mean of its divisors is an integer number (86538578).

Almost surely, 2^866686668 is an apocalyptic number.

It is an amenable number.

866686668 is an abundant number, since it is smaller than the sum of its proper divisors (1210239204).

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

866686668 is a wasteful number, since it uses less digits than its factorization.

866686668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1952041 (or 1952039 counting only the distinct ones).

The product of its digits is 23887872, while the sum is 60.

The square root of 866686668 is about 29439.5425915553. The cubic root of 866686668 is about 953.4268364231.

The spelling of 866686668 in words is "eight hundred sixty-six million, six hundred eighty-six thousand, six hundred sixty-eight".