865173198816 has 192 divisors, whose sum is σ = 2553502190400. Its totient is φ = 284962848768.

The previous prime is 865173198797. The next prime is 865173198829. The reversal of 865173198816 is 618891371568.

865173198816 is a `hidden beast` number, since 8 + 6 + 517 + 31 + 9 + 8 + 81 + 6 = 666.

865173198816 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54718720 + ... + 54734528.

It is an arithmetic number, because the mean of its divisors is an integer number (13299490575).

Almost surely, 2^865173198816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 865173198816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1276751095200).

865173198816 is an abundant number, since it is smaller than the sum of its proper divisors (1688328991584).

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

865173198816 is a wasteful number, since it uses less digits than its factorization.

865173198816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16578 (or 16564 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 63.

The spelling of 865173198816 in words is "eight hundred sixty-five billion, one hundred seventy-three million, one hundred ninety-eight thousand, eight hundred sixteen".