866845647 has 12 divisors (see below), whose sum is σ = 1252475224. Its totient is φ = 577728720.

The previous prime is 866845619. The next prime is 866845663. The reversal of 866845647 is 746548668.

It is not a de Polignac number, because 866845647 - 2⁷ = 866845519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 866845593 and 866845602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866845547) 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 in 11 ways as a sum of consecutive naturals, for example, 23997 + ... + 48057.

Almost surely, 2^866845647 is an apocalyptic number.

866845647 is a deficient number, since it is larger than the sum of its proper divisors (385629577).

866845647 is a wasteful number, since it uses less digits than its factorization.

866845647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28070 (or 28067 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 54.

The square root of 866845647 is about 29442.2425606474. The cubic root of 866845647 is about 953.4851295309.

The spelling of 866845647 in words is "eight hundred sixty-six million, eight hundred forty-five thousand, six hundred forty-seven".