865808888880 has 480 divisors, whose sum is σ = 3160576977984. Its totient is φ = 195158605824.

The previous prime is 865808888849. The next prime is 865808888909. The reversal of 865808888880 is 88888808568.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 25495272 + ... + 25529208.

Almost surely, 2^865808888880 is an apocalyptic number.

865808888880 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 865808888880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1580288488992).

865808888880 is an abundant number, since it is smaller than the sum of its proper divisors (2294768089104).

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

865808888880 is a wasteful number, since it uses less digits than its factorization.

865808888880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34033 (or 34014 counting only the distinct ones).

The product of its (nonzero) digits is 503316480, while the sum is 75.

The spelling of 865808888880 in words is "eight hundred sixty-five billion, eight hundred eight million, eight hundred eighty-eight thousand, eight hundred eighty".