865313280000 has 1560 divisors, whose sum is σ = 3520798208928. Its totient is φ = 211009536000.

The previous prime is 865313279977. The next prime is 865313280001. The reversal of 865313280000 is 82313568.

865313280000 is a `hidden beast` number, since 8 + 65 + 313 + 280 + 0 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1560).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865313280001) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 8087039947 + ... + 8087040053.

Almost surely, 2^865313280000 is an apocalyptic number.

865313280000 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 865313280000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1760399104464).

865313280000 is an abundant number, since it is smaller than the sum of its proper divisors (2655484928928).

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

865313280000 is an equidigital number, since it uses as much as digits as its factorization.

865313280000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

Adding to 865313280000 its reverse (82313568), we get a palindrome (865395593568).

The spelling of 865313280000 in words is "eight hundred sixty-five billion, three hundred thirteen million, two hundred eighty thousand".