6856474805 has 18 divisors (see below), whose sum is σ = 8688059586. Its totient is φ = 5193819936.

The previous prime is 6856474771. The next prime is 6856474819. The reversal of 6856474805 is 5084746586.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2512214884 + 4344259921 = 50122^2 + 65911^2 .

It is not a de Polignac number, because 6856474805 - 2¹⁸ = 6856212661 is a prime.

It is a super-2 number, since 2×6856474805² = 94022493503199576050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3516971 + ... + 3518919.

It is an arithmetic number, because the mean of its divisors is an integer number (482669977).

Almost surely, 2^6856474805 is an apocalyptic number.

It is an amenable number.

6856474805 is a deficient number, since it is larger than the sum of its proper divisors (1831584781).

6856474805 is an frugal number, since it uses more digits than its factorization.

6856474805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3941 (or 1973 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 53.

The square root of 6856474805 is about 82803.8332747947. The cubic root of 6856474805 is about 1899.7668047134.

The spelling of 6856474805 in words is "six billion, eight hundred fifty-six million, four hundred seventy-four thousand, eight hundred five".