856659343922 has 18 divisors (see below), whose sum is σ = 1306521518679. Its totient is φ = 421268605920.

The previous prime is 856659343849. The next prime is 856659344071. The reversal of 856659343922 is 229343956658.

It can be written as a sum of positive squares in 5 ways, for example, as 154953236881 + 701706107041 = 393641^2 + 837679^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=654469.

It is a Duffinian number.

It is an unprimeable number.

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 8 ways as a sum of consecutive naturals, for example, 79839854 + ... + 79850582.

Almost surely, 2^856659343922 is an apocalyptic number.

856659343922 is a deficient number, since it is larger than the sum of its proper divisors (449862174757).

856659343922 is an frugal number, since it uses more digits than its factorization.

856659343922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21582 (or 10792 counting only the distinct ones).

The product of its digits is 83980800, while the sum is 62.

The spelling of 856659343922 in words is "eight hundred fifty-six billion, six hundred fifty-nine million, three hundred forty-three thousand, nine hundred twenty-two".