865566051 has 16 divisors (see below), whose sum is σ = 1320000000. Its totient is φ = 494218368.

The previous prime is 865566043. The next prime is 865566127. The reversal of 865566051 is 150665568.

It is not a de Polignac number, because 865566051 - 2³ = 865566043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 865565994 and 865566012.

It is not an unprimeable number, because it can be changed into a prime (865566001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12075 + ... + 43323.

It is an arithmetic number, because the mean of its divisors is an integer number (82500000).

Almost surely, 2^865566051 is an apocalyptic number.

865566051 is a deficient number, since it is larger than the sum of its proper divisors (454433949).

865566051 is a wasteful number, since it uses less digits than its factorization.

865566051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32578.

The product of its (nonzero) digits is 216000, while the sum is 42.

The square root of 865566051 is about 29420.5039215850. The cubic root of 865566051 is about 953.0157354721.

The spelling of 865566051 in words is "eight hundred sixty-five million, five hundred sixty-six thousand, fifty-one".