865939842432 has 256 divisors, whose sum is σ = 2922765120000. Its totient is φ = 247247382528.

The previous prime is 865939842403. The next prime is 865939842451. The reversal of 865939842432 is 234248939568.

It is a happy number.

865939842432 is a `hidden beast` number, since 8 + 6 + 5 + 93 + 98 + 424 + 32 = 666.

It is a super-2 number, since 2×865939842432² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 865939842432.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39155794 + ... + 39177902.

It is an arithmetic number, because the mean of its divisors is an integer number (11417051250).

Almost surely, 2^865939842432 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 865939842432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1461382560000).

865939842432 is an abundant number, since it is smaller than the sum of its proper divisors (2056825277568).

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

865939842432 is a wasteful number, since it uses less digits than its factorization.

865939842432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23758 (or 23740 counting only the distinct ones).

The product of its digits is 89579520, while the sum is 63.

The spelling of 865939842432 in words is "eight hundred sixty-five billion, nine hundred thirty-nine million, eight hundred forty-two thousand, four hundred thirty-two".