866432321 has 2 divisors, whose sum is σ = 866432322. Its totient is φ = 866432320.

The previous prime is 866432261. The next prime is 866432323. The reversal of 866432321 is 123234668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 820192321 + 46240000 = 28639^2 + 6800^2 .

It is a cyclic number.

It is not a de Polignac number, because 866432321 - 2¹⁴ = 866415937 is a prime.

Together with 866432323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (866432323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433216160 + 433216161.

It is an arithmetic number, because the mean of its divisors is an integer number (433216161).

Almost surely, 2^866432321 is an apocalyptic number.

It is an amenable number.

866432321 is a deficient number, since it is larger than the sum of its proper divisors (1).

866432321 is an equidigital number, since it uses as much as digits as its factorization.

866432321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 35.

The square root of 866432321 is about 29435.2224554190. Note that the first 3 decimals coincide. The cubic root of 866432321 is about 953.3335597366. Note that the first 3 decimals are identical.

Adding to 866432321 its reverse (123234668), we get a palindrome (989666989).

The spelling of 866432321 in words is "eight hundred sixty-six million, four hundred thirty-two thousand, three hundred twenty-one".