6809551856 has 20 divisors (see below), whose sum is σ = 13767138192. Its totient is φ = 3256742016.

The previous prime is 6809551843. The next prime is 6809551897. The reversal of 6809551856 is 6581559086.

It is a junction number, because it is equal to n+sod(n) for n = 6809551798 and 6809551807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9251741 + ... + 9252476.

Almost surely, 2^6809551856 is an apocalyptic number.

It is an amenable number.

6809551856 is an abundant number, since it is smaller than the sum of its proper divisors (6957586336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6809551856 is a wasteful number, since it uses less digits than its factorization.

6809551856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18504248 (or 18504242 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 53.

The square root of 6809551856 is about 82520.0088221033. The cubic root of 6809551856 is about 1895.4231348120.

The spelling of 6809551856 in words is "six billion, eight hundred nine million, five hundred fifty-one thousand, eight hundred fifty-six".