865233861120 has 400 divisors, whose sum is σ = 3106319531040. Its totient is φ = 230183755776.

The previous prime is 865233861101. The next prime is 865233861139. The reversal of 865233861120 is 21168332568.

865233861120 is a `hidden beast` number, since 8 + 6 + 5 + 2 + 3 + 3 + 8 + 611 + 20 = 666.

865233861120 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (865233861101) and next prime (865233861139).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 91855771 + ... + 91865189.

Almost surely, 2^865233861120 is an apocalyptic number.

865233861120 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 865233861120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1553159765520).

865233861120 is an abundant number, since it is smaller than the sum of its proper divisors (2241085669920).

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

865233861120 is an equidigital number, since it uses as much as digits as its factorization.

865233861120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9897 (or 9872 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 865233861120 in words is "eight hundred sixty-five billion, two hundred thirty-three million, eight hundred sixty-one thousand, one hundred twenty".