866557313 has 2 divisors, whose sum is σ = 866557314. Its totient is φ = 866557312.

The previous prime is 866557309. The next prime is 866557327. The reversal of 866557313 is 313755668.

866557313 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., 575616064 + 290941249 = 23992^2 + 17057^2 .

It is a cyclic number.

It is not a de Polignac number, because 866557313 - 2² = 866557309 is a prime.

It is not a weakly prime, because it can be changed into another prime (866557213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433278656 + 433278657.

It is an arithmetic number, because the mean of its divisors is an integer number (433278657).

Almost surely, 2^866557313 is an apocalyptic number.

It is an amenable number.

866557313 is a deficient number, since it is larger than the sum of its proper divisors (1).

866557313 is an equidigital number, since it uses as much as digits as its factorization.

866557313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 453600, while the sum is 44.

The square root of 866557313 is about 29437.3455494887. The cubic root of 866557313 is about 953.3794003391.

The spelling of 866557313 in words is "eight hundred sixty-six million, five hundred fifty-seven thousand, three hundred thirteen".