689166866 has 8 divisors (see below), whose sum is σ = 1047911484. Its totient is φ = 339863040.

The previous prime is 689166857. The next prime is 689166883. The reversal of 689166866 is 668661986.

It can be written as a sum of positive squares in 2 ways, for example, as 682515625 + 6651241 = 26125^2 + 2579^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2360015 + ... + 2360306.

Almost surely, 2^689166866 is an apocalyptic number.

689166866 is a deficient number, since it is larger than the sum of its proper divisors (358744618).

689166866 is a wasteful number, since it uses less digits than its factorization.

689166866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4720396.

The product of its digits is 4478976, while the sum is 56.

The square root of 689166866 is about 26251.9878485421. The cubic root of 689166866 is about 883.2997951271.

The spelling of 689166866 in words is "six hundred eighty-nine million, one hundred sixty-six thousand, eight hundred sixty-six".