866373689 has 2 divisors, whose sum is σ = 866373690. Its totient is φ = 866373688.

The previous prime is 866373661. The next prime is 866373707. The reversal of 866373689 is 986373668.

866373689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 523494400 + 342879289 = 22880^2 + 18517^2 .

It is a cyclic number.

It is not a de Polignac number, because 866373689 - 2¹² = 866369593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (866373649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433186844 + 433186845.

It is an arithmetic number, because the mean of its divisors is an integer number (433186845).

Almost surely, 2^866373689 is an apocalyptic number.

It is an amenable number.

866373689 is a deficient number, since it is larger than the sum of its proper divisors (1).

866373689 is an equidigital number, since it uses as much as digits as its factorization.

866373689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7838208, while the sum is 56.

The square root of 866373689 is about 29434.2264889023. The cubic root of 866373689 is about 953.3120550317.

The spelling of 866373689 in words is "eight hundred sixty-six million, three hundred seventy-three thousand, six hundred eighty-nine".