865008209004 has 24 divisors (see below), whose sum is σ = 2087950850160. Its totient is φ = 278393446464.

The previous prime is 865008208973. The next prime is 865008209047. The reversal of 865008209004 is 400902800568.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1242827539 + ... + 1242828234.

It is an arithmetic number, because the mean of its divisors is an integer number (86997952090).

Almost surely, 2^865008209004 is an apocalyptic number.

It is an amenable number.

865008209004 is an abundant number, since it is smaller than the sum of its proper divisors (1222942641156).

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

865008209004 is a wasteful number, since it uses less digits than its factorization.

865008209004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2485655809 (or 2485655807 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The spelling of 865008209004 in words is "eight hundred sixty-five billion, eight million, two hundred nine thousand, four".