866560851 has 18 divisors (see below), whose sum is σ = 1355392428. Its totient is φ = 533267280.

The previous prime is 866560847. The next prime is 866560853. The reversal of 866560851 is 158065668.

866560851 is a `hidden beast` number, since 8 + 6 + 6 + 560 + 85 + 1 = 666.

It is not a de Polignac number, because 866560851 - 2² = 866560847 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 866560797 and 866560806.

It is not an unprimeable number, because it can be changed into a prime (866560853) 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 17 ways as a sum of consecutive naturals, for example, 283345 + ... + 286386.

Almost surely, 2^866560851 is an apocalyptic number.

866560851 is a deficient number, since it is larger than the sum of its proper divisors (488831577).

866560851 is a wasteful number, since it uses less digits than its factorization.

866560851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569763 (or 569747 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The square root of 866560851 is about 29437.4056431609. The cubic root of 866560851 is about 953.3806978304.

The spelling of 866560851 in words is "eight hundred sixty-six million, five hundred sixty thousand, eight hundred fifty-one".