866320811 has 2 divisors, whose sum is σ = 866320812. Its totient is φ = 866320810.

The previous prime is 866320769. The next prime is 866320817. The reversal of 866320811 is 118023668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866320811 - 2¹⁰ = 866319787 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (866320817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433160405 + 433160406.

It is an arithmetic number, because the mean of its divisors is an integer number (433160406).

Almost surely, 2^866320811 is an apocalyptic number.

866320811 is a deficient number, since it is larger than the sum of its proper divisors (1).

866320811 is an equidigital number, since it uses as much as digits as its factorization.

866320811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 866320811 is about 29433.3282351826. The cubic root of 866320811 is about 953.2926599135.

The spelling of 866320811 in words is "eight hundred sixty-six million, three hundred twenty thousand, eight hundred eleven".