866456117 has 2 divisors, whose sum is σ = 866456118. Its totient is φ = 866456116.

The previous prime is 866456099. The next prime is 866456179. The reversal of 866456117 is 711654668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 781705681 + 84750436 = 27959^2 + 9206^2 .

It is a cyclic number.

It is not a de Polignac number, because 866456117 - 2⁸ = 866455861 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866456197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433228058 + 433228059.

It is an arithmetic number, because the mean of its divisors is an integer number (433228059).

Almost surely, 2^866456117 is an apocalyptic number.

It is an amenable number.

866456117 is a deficient number, since it is larger than the sum of its proper divisors (1).

866456117 is an equidigital number, since it uses as much as digits as its factorization.

866456117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The square root of 866456117 is about 29435.6266622608. The cubic root of 866456117 is about 953.3422872187.

The spelling of 866456117 in words is "eight hundred sixty-six million, four hundred fifty-six thousand, one hundred seventeen".