6855869039 has 4 divisors (see below), whose sum is σ = 6856566456. Its totient is φ = 6855171624.

The previous prime is 6855868993. The next prime is 6855869071. The reversal of 6855869039 is 9309685586.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6855869039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6855869099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333749 + ... + 353694.

It is an arithmetic number, because the mean of its divisors is an integer number (1714141614).

Almost surely, 2^6855869039 is an apocalyptic number.

6855869039 is a deficient number, since it is larger than the sum of its proper divisors (697417).

6855869039 is an equidigital number, since it uses as much as digits as its factorization.

6855869039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697416.

The product of its (nonzero) digits is 13996800, while the sum is 59.

The square root of 6855869039 is about 82800.1753560945. The cubic root of 6855869039 is about 1899.7108552611.

The spelling of 6855869039 in words is "six billion, eight hundred fifty-five million, eight hundred sixty-nine thousand, thirty-nine".