866530321 has 12 divisors (see below), whose sum is σ = 944050944. Its totient is φ = 794431800.

The previous prime is 866530319. The next prime is 866530349. The reversal of 866530321 is 123035668.

It is not a de Polignac number, because 866530321 - 2¹ = 866530319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866530351) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 27525 + ... + 49906.

It is an arithmetic number, because the mean of its divisors is an integer number (78670912).

Almost surely, 2^866530321 is an apocalyptic number.

It is an amenable number.

866530321 is a deficient number, since it is larger than the sum of its proper divisors (77520623).

866530321 is a wasteful number, since it uses less digits than its factorization.

866530321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77500 (or 77481 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 866530321 is about 29436.8870806680. The cubic root of 866530321 is about 953.3695014424.

Adding to 866530321 its reverse (123035668), we get a palindrome (989565989).

The spelling of 866530321 in words is "eight hundred sixty-six million, five hundred thirty thousand, three hundred twenty-one".