866800829 has 2 divisors, whose sum is σ = 866800830. Its totient is φ = 866800828.

The previous prime is 866800819. The next prime is 866800841. The reversal of 866800829 is 928008668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 856732900 + 10067929 = 29270^2 + 3173^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866800829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866800819) 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 as a sum of consecutive naturals, namely, 433400414 + 433400415.

It is an arithmetic number, because the mean of its divisors is an integer number (433400415).

Almost surely, 2^866800829 is an apocalyptic number.

It is an amenable number.

866800829 is a deficient number, since it is larger than the sum of its proper divisors (1).

866800829 is an equidigital number, since it uses as much as digits as its factorization.

866800829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 331776, while the sum is 47.

The square root of 866800829 is about 29441.4814335149. The cubic root of 866800829 is about 953.4686967579.

The spelling of 866800829 in words is "eight hundred sixty-six million, eight hundred thousand, eight hundred twenty-nine".