865438551744 has 168 divisors, whose sum is σ = 2484301886352. Its totient is φ = 265772482560.

The previous prime is 865438551739. The next prime is 865438551869. The reversal of 865438551744 is 447155834568.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16879812 + ... + 16931004.

Almost surely, 2^865438551744 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 865438551744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1242150943176).

865438551744 is an abundant number, since it is smaller than the sum of its proper divisors (1618863334608).

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

865438551744 is a wasteful number, since it uses less digits than its factorization.

865438551744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51755 (or 51732 counting only the distinct ones).

The product of its digits is 64512000, while the sum is 60.

The spelling of 865438551744 in words is "eight hundred sixty-five billion, four hundred thirty-eight million, five hundred fifty-one thousand, seven hundred forty-four".