866996813 has 2 divisors, whose sum is σ = 866996814. Its totient is φ = 866996812.

The previous prime is 866996807. The next prime is 866996857. The reversal of 866996813 is 318699668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 861246409 + 5750404 = 29347^2 + 2398^2 .

It is a cyclic number.

It is not a de Polignac number, because 866996813 - 2¹⁶ = 866931277 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866996513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433498406 + 433498407.

It is an arithmetic number, because the mean of its divisors is an integer number (433498407).

Almost surely, 2^866996813 is an apocalyptic number.

It is an amenable number.

866996813 is a deficient number, since it is larger than the sum of its proper divisors (1).

866996813 is an equidigital number, since it uses as much as digits as its factorization.

866996813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3359232, while the sum is 56.

The square root of 866996813 is about 29444.8096105239. The cubic root of 866996813 is about 953.5405512222.

The spelling of 866996813 in words is "eight hundred sixty-six million, nine hundred ninety-six thousand, eight hundred thirteen".