865506897 has 8 divisors (see below), whose sum is σ = 1282232480. Its totient is φ = 577004580.

The previous prime is 865506893. The next prime is 865506989. The reversal of 865506897 is 798605568.

865506897 is a `hidden beast` number, since 8 + 6 + 550 + 6 + 89 + 7 = 666.

865506897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 865506897 - 2² = 865506893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (865506893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16027879 + ... + 16027932.

It is an arithmetic number, because the mean of its divisors is an integer number (160279060).

Almost surely, 2^865506897 is an apocalyptic number.

It is an amenable number.

865506897 is a deficient number, since it is larger than the sum of its proper divisors (416725583).

865506897 is a wasteful number, since it uses less digits than its factorization.

865506897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32055820 (or 32055814 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 54.

The square root of 865506897 is about 29419.4985851221. The cubic root of 865506897 is about 952.9940248327.

The spelling of 865506897 in words is "eight hundred sixty-five million, five hundred six thousand, eight hundred ninety-seven".