866218447 has 2 divisors, whose sum is σ = 866218448. Its totient is φ = 866218446.

The previous prime is 866218421. The next prime is 866218499. The reversal of 866218447 is 744812668.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866218447 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 866218397 and 866218406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866288447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433109223 + 433109224.

It is an arithmetic number, because the mean of its divisors is an integer number (433109224).

Almost surely, 2^866218447 is an apocalyptic number.

866218447 is a deficient number, since it is larger than the sum of its proper divisors (1).

866218447 is an equidigital number, since it uses as much as digits as its factorization.

866218447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 46.

The square root of 866218447 is about 29431.5892707139. The cubic root of 866218447 is about 953.2551115856.

The spelling of 866218447 in words is "eight hundred sixty-six million, two hundred eighteen thousand, four hundred forty-seven".