865684163204 has 48 divisors (see below), whose sum is σ = 1737293515776. Its totient is φ = 369738314400.

The previous prime is 865684163173. The next prime is 865684163207. The reversal of 865684163204 is 402361486568.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (865684163207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68638859 + ... + 68651469.

It is an arithmetic number, because the mean of its divisors is an integer number (36193614912).

Almost surely, 2^865684163204 is an apocalyptic number.

It is an amenable number.

865684163204 is an abundant number, since it is smaller than the sum of its proper divisors (871609352572).

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

865684163204 is a wasteful number, since it uses less digits than its factorization.

865684163204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20816 (or 20814 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 53.

The spelling of 865684163204 in words is "eight hundred sixty-five billion, six hundred eighty-four million, one hundred sixty-three thousand, two hundred four".