866129773 has 2 divisors, whose sum is σ = 866129774. Its totient is φ = 866129772.

The previous prime is 866129749. The next prime is 866129807. The reversal of 866129773 is 377921668.

It is a happy number.

866129773 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 696009924 + 170119849 = 26382^2 + 13043^2 .

It is a cyclic number.

It is not a de Polignac number, because 866129773 - 2⁵ = 866129741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866129723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433064886 + 433064887.

It is an arithmetic number, because the mean of its divisors is an integer number (433064887).

Almost surely, 2^866129773 is an apocalyptic number.

It is an amenable number.

866129773 is a deficient number, since it is larger than the sum of its proper divisors (1).

866129773 is an equidigital number, since it uses as much as digits as its factorization.

866129773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 49.

The square root of 866129773 is about 29430.0827895540. The cubic root of 866129773 is about 953.2225825207. Note that the first 3 decimals are identical.

The spelling of 866129773 in words is "eight hundred sixty-six million, one hundred twenty-nine thousand, seven hundred seventy-three".