6856814959 has 12 divisors (see below), whose sum is σ = 7027542912. Its totient is φ = 6690146400.

The previous prime is 6856814953. The next prime is 6856814971. The reversal of 6856814959 is 9594186586.

It is not a de Polignac number, because 6856814959 - 2⁷ = 6856814831 is a prime.

It is a super-2 number, since 2×6856814959² = 94031822763932343362, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6856814897 and 6856814906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6856814953) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2718619 + ... + 2721139.

It is an arithmetic number, because the mean of its divisors is an integer number (585628576).

Almost surely, 2^6856814959 is an apocalyptic number.

6856814959 is a deficient number, since it is larger than the sum of its proper divisors (170727953).

6856814959 is a wasteful number, since it uses less digits than its factorization.

6856814959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4078 (or 4035 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 61.

The square root of 6856814959 is about 82805.8872242789. The cubic root of 6856814959 is about 1899.7982204001.

The spelling of 6856814959 in words is "six billion, eight hundred fifty-six million, eight hundred fourteen thousand, nine hundred fifty-nine".