6851573856 has 72 divisors (see below), whose sum is σ = 19626496344. Its totient is φ = 2267174400.

The previous prime is 6851573821. The next prime is 6851573879. The reversal of 6851573856 is 6583751586.

6851573856 is a `hidden beast` number, since 6 + 8 + 515 + 73 + 8 + 56 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47370 + ... + 126281.

It is an arithmetic number, because the mean of its divisors is an integer number (272590227).

Almost surely, 2^6851573856 is an apocalyptic number.

It is an amenable number.

6851573856 is an abundant number, since it is smaller than the sum of its proper divisors (12774922488).

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

6851573856 is a wasteful number, since it uses less digits than its factorization.

6851573856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173804 (or 173793 counting only the distinct ones).

The product of its digits is 6048000, while the sum is 54.

The square root of 6851573856 is about 82774.2342519700. The cubic root of 6851573856 is about 1899.3140511843.

The spelling of 6851573856 in words is "six billion, eight hundred fifty-one million, five hundred seventy-three thousand, eight hundred fifty-six".