866989667 has 4 divisors (see below), whose sum is σ = 869405040. Its totient is φ = 864574296.

The previous prime is 866989657. The next prime is 866989691. The reversal of 866989667 is 766989668.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 866989667 - 2²⁰ = 865941091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866989657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1207148 + ... + 1207865.

It is an arithmetic number, because the mean of its divisors is an integer number (217351260).

Almost surely, 2^866989667 is an apocalyptic number.

866989667 is a deficient number, since it is larger than the sum of its proper divisors (2415373).

866989667 is a wasteful number, since it uses less digits than its factorization.

866989667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2415372.

The product of its digits is 47029248, while the sum is 65.

The square root of 866989667 is about 29444.6882646089. The cubic root of 866989667 is about 953.5379314434.

Subtracting from 866989667 its reverse (766989668), we obtain a palindrome (99999999).

The spelling of 866989667 in words is "eight hundred sixty-six million, nine hundred eighty-nine thousand, six hundred sixty-seven".