856085355257 has 4 divisors (see below), whose sum is σ = 933911296656. Its totient is φ = 778259413860.

The previous prime is 856085355199. The next prime is 856085355319. The reversal of 856085355257 is 752553580658.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 856085355257 - 2²² = 856081160953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 856085355196 and 856085355205.

It is not an unprimeable number, because it can be changed into a prime (856085355557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38912970683 + ... + 38912970704.

It is an arithmetic number, because the mean of its divisors is an integer number (233477824164).

Almost surely, 2^856085355257 is an apocalyptic number.

It is an amenable number.

856085355257 is a deficient number, since it is larger than the sum of its proper divisors (77825941399).

856085355257 is a wasteful number, since it uses less digits than its factorization.

856085355257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77825941398.

The product of its (nonzero) digits is 50400000, while the sum is 59.

The spelling of 856085355257 in words is "eight hundred fifty-six billion, eighty-five million, three hundred fifty-five thousand, two hundred fifty-seven".