865884019012 has 6 divisors (see below), whose sum is σ = 1515297033278. Its totient is φ = 432942009504.

The previous prime is 865884018997. The next prime is 865884019043. The reversal of 865884019012 is 210910488568.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 688292573956 + 177591445056 = 829634^2 + 421416^2 .

It is a super-2 number, since 2×865884019012² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108235502373 + ... + 108235502380.

Almost surely, 2^865884019012 is an apocalyptic number.

It is an amenable number.

865884019012 is a deficient number, since it is larger than the sum of its proper divisors (649413014266).

865884019012 is a wasteful number, since it uses less digits than its factorization.

865884019012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216471004757 (or 216471004755 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 52.

The spelling of 865884019012 in words is "eight hundred sixty-five billion, eight hundred eighty-four million, nineteen thousand, twelve".