865566012 has 24 divisors (see below), whose sum is σ = 2074240336. Its totient is φ = 280723968.

The previous prime is 865566011. The next prime is 865566019. The reversal of 865566012 is 210665568.

It is a super-2 number, since 2×865566012² = 1498409042259168288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865566011) 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 7 ways as a sum of consecutive naturals, for example, 974293 + ... + 975180.

Almost surely, 2^865566012 is an apocalyptic number.

It is an amenable number.

865566012 is an abundant number, since it is smaller than the sum of its proper divisors (1208674324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

865566012 is a wasteful number, since it uses less digits than its factorization.

865566012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949517 (or 1949515 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 39.

The square root of 865566012 is about 29420.5032587820. The cubic root of 865566012 is about 953.0157211587.

The spelling of 865566012 in words is "eight hundred sixty-five million, five hundred sixty-six thousand, twelve".