859666447 has 2 divisors, whose sum is σ = 859666448. Its totient is φ = 859666446.

The previous prime is 859666333. The next prime is 859666529. The reversal of 859666447 is 744666958.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 859666447 - 2¹⁹ = 859142159 is a prime.

It is a super-3 number, since 3×859666447³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (859666747) 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, 429833223 + 429833224.

It is an arithmetic number, because the mean of its divisors is an integer number (429833224).

Almost surely, 2^859666447 is an apocalyptic number.

859666447 is a deficient number, since it is larger than the sum of its proper divisors (1).

859666447 is an equidigital number, since it uses as much as digits as its factorization.

859666447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8709120, while the sum is 55.

The square root of 859666447 is about 29320.0690142435. The cubic root of 859666447 is about 950.8455802874.

The spelling of 859666447 in words is "eight hundred fifty-nine million, six hundred sixty-six thousand, four hundred forty-seven".