6870781365865 has 8 divisors (see below), whose sum is σ = 8246595609288. Its totient is φ = 5495519779200.

The previous prime is 6870781365857. The next prime is 6870781365871. The reversal of 6870781365865 is 5685631870786.

It can be written as a sum of positive squares in 4 ways, for example, as 51538534441 + 6819242831424 = 227021^2 + 2611368^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6870781365865 - 2³ = 6870781365857 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6870781365794 and 6870781365803.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138136836 + ... + 138186565.

It is an arithmetic number, because the mean of its divisors is an integer number (1030824451161).

Almost surely, 2^{6870781365865} is an apocalyptic number.

It is an amenable number.

6870781365865 is a deficient number, since it is larger than the sum of its proper divisors (1375814243423).

6870781365865 is a wasteful number, since it uses less digits than its factorization.

6870781365865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276328379.

The product of its (nonzero) digits is 406425600, while the sum is 70.

The spelling of 6870781365865 in words is "six trillion, eight hundred seventy billion, seven hundred eighty-one million, three hundred sixty-five thousand, eight hundred sixty-five".