865319086080 has 960 divisors, whose sum is σ = 3289579413120. Its totient is φ = 217103597568.

The previous prime is 865319086061. The next prime is 865319086081. The reversal of 865319086080 is 80680913568.

It is a tau number, because it is divible by the number of its divisors (960).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (865319086081) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1278166702 + ... + 1278167378.

It is an arithmetic number, because the mean of its divisors is an integer number (3426645222).

Almost surely, 2^865319086080 is an apocalyptic number.

865319086080 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 865319086080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1644789706560).

865319086080 is an abundant number, since it is smaller than the sum of its proper divisors (2424260327040).

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

865319086080 is a wasteful number, since it uses less digits than its factorization.

865319086080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806 (or 777 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The spelling of 865319086080 in words is "eight hundred sixty-five billion, three hundred nineteen million, eighty-six thousand, eighty".