866163289 has 2 divisors, whose sum is σ = 866163290. Its totient is φ = 866163288.

The previous prime is 866163283. The next prime is 866163307. The reversal of 866163289 is 982361668.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 539168400 + 326994889 = 23220^2 + 18083^2 .

It is a cyclic number.

It is not a de Polignac number, because 866163289 - 2⁷ = 866163161 is a prime.

It is a super-2 number, since 2×866163289² = 1500477686422595042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (866163283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433081644 + 433081645.

It is an arithmetic number, because the mean of its divisors is an integer number (433081645).

Almost surely, 2^866163289 is an apocalyptic number.

It is an amenable number.

866163289 is a deficient number, since it is larger than the sum of its proper divisors (1).

866163289 is an equidigital number, since it uses as much as digits as its factorization.

866163289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 49.

The square root of 866163289 is about 29430.6522014039. The cubic root of 866163289 is about 953.2348777513.

The spelling of 866163289 in words is "eight hundred sixty-six million, one hundred sixty-three thousand, two hundred eighty-nine".