6856799039 has 4 divisors (see below), whose sum is σ = 6857641320. Its totient is φ = 6855956760.

The previous prime is 6856799011. The next prime is 6856799069. The reversal of 6856799039 is 9309976586.

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

It is a cyclic number.

It is not a de Polignac number, because 6856799039 - 2¹⁶ = 6856733503 is a prime.

It is a super-2 number, since 2×6856799039² = 94031386122462647042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6856799069) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 408809 + ... + 425250.

It is an arithmetic number, because the mean of its divisors is an integer number (1714410330).

Almost surely, 2^6856799039 is an apocalyptic number.

6856799039 is a deficient number, since it is larger than the sum of its proper divisors (842281).

6856799039 is an equidigital number, since it uses as much as digits as its factorization.

6856799039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842280.

The product of its (nonzero) digits is 22044960, while the sum is 62.

The square root of 6856799039 is about 82805.7910957923. The cubic root of 6856799039 is about 1899.7967500959.

The spelling of 6856799039 in words is "six billion, eight hundred fifty-six million, seven hundred ninety-nine thousand, thirty-nine".