865605444216 has 16 divisors (see below), whose sum is σ = 2164013610600. Its totient is φ = 288535148064.

The previous prime is 865605444169. The next prime is 865605444419. The reversal of 865605444216 is 612444506568.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18033446731 + ... + 18033446778.

Almost surely, 2^865605444216 is an apocalyptic number.

It is an amenable number.

865605444216 is an abundant number, since it is smaller than the sum of its proper divisors (1298408166384).

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

865605444216 is a wasteful number, since it uses less digits than its factorization.

865605444216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36066893518 (or 36066893514 counting only the distinct ones).

The product of its (nonzero) digits is 5529600, while the sum is 51.

The spelling of 865605444216 in words is "eight hundred sixty-five billion, six hundred five million, four hundred forty-four thousand, two hundred sixteen".