866032321 has 12 divisors (see below), whose sum is σ = 1099010160. Its totient is φ = 674829960.

The previous prime is 866032289. The next prime is 866032333. The reversal of 866032321 is 123230668.

It is not a de Polignac number, because 866032321 - 2⁵ = 866032289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866032021) 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, 802831 + ... + 803908.

It is an arithmetic number, because the mean of its divisors is an integer number (91584180).

Almost surely, 2^866032321 is an apocalyptic number.

It is an amenable number.

866032321 is a deficient number, since it is larger than the sum of its proper divisors (232977839).

866032321 is a wasteful number, since it uses less digits than its factorization.

866032321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606764 (or 1606757 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 866032321 is about 29428.4270901453. The cubic root of 866032321 is about 953.1868307838.

Adding to 866032321 its reverse (123230668), we get a palindrome (989262989).

The spelling of 866032321 in words is "eight hundred sixty-six million, thirty-two thousand, three hundred twenty-one".