6853663865 has 8 divisors (see below), whose sum is σ = 8224843848. Its totient is φ = 5482632960.

The previous prime is 6853663847. The next prime is 6853663877. The reversal of 6853663865 is 5683663586.

6853663865 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 783384121 + 6070279744 = 27989^2 + 77912^2 .

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

It is not a de Polignac number, because 6853663865 - 2¹⁰ = 6853662841 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6853663865.

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, 144305 + ... + 185825.

It is an arithmetic number, because the mean of its divisors is an integer number (1028105481).

Almost surely, 2^6853663865 is an apocalyptic number.

It is an amenable number.

6853663865 is a deficient number, since it is larger than the sum of its proper divisors (1371179983).

6853663865 is a wasteful number, since it uses less digits than its factorization.

6853663865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74539.

The product of its digits is 18662400, while the sum is 56.

The square root of 6853663865 is about 82786.8580452236. The cubic root of 6853663865 is about 1899.5071542574.

The spelling of 6853663865 in words is "six billion, eight hundred fifty-three million, six hundred sixty-three thousand, eight hundred sixty-five".