865212243968 has 126 divisors (see below), whose sum is σ = 1778937782859. Its totient is φ = 420777541632.

The previous prime is 865212243947. The next prime is 865212244027. The reversal of 865212243968 is 869342212568.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 432606121984 + 432606121984 = 657728^2 + 657728^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=657728.

It is a super-2 number, since 2×865212243968² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3620134793 + ... + 3620135031.

Almost surely, 2^865212243968 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 865212243968

865212243968 is an abundant number, since it is smaller than the sum of its proper divisors (913725538891).

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

865212243968 is an frugal number, since it uses more digits than its factorization.

865212243968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590 (or 284 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 56.

The spelling of 865212243968 in words is "eight hundred sixty-five billion, two hundred twelve million, two hundred forty-three thousand, nine hundred sixty-eight".