800078642865 has 12 divisors (see below), whose sum is σ = 1386802981044. Its totient is φ = 426708609504.

The previous prime is 800078642837. The next prime is 800078642879. The reversal of 800078642865 is 568246870008.

800078642865 is a `hidden beast` number, since 80 + 0 + 0 + 7 + 86 + 428 + 65 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 482046935616 + 318031707249 = 694296^2 + 563943^2 .

It is not a de Polignac number, because 800078642865 - 2¹⁶ = 800078577329 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8889762654 + ... + 8889762743.

It is an arithmetic number, because the mean of its divisors is an integer number (115566915087).

Almost surely, 2^800078642865 is an apocalyptic number.

It is an amenable number.

800078642865 is a deficient number, since it is larger than the sum of its proper divisors (586724338179).

800078642865 is a wasteful number, since it uses less digits than its factorization.

800078642865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17779525408 (or 17779525405 counting only the distinct ones).

The product of its (nonzero) digits is 5160960, while the sum is 54.

The spelling of 800078642865 in words is "eight hundred billion, seventy-eight million, six hundred forty-two thousand, eight hundred sixty-five".