856307943273 has 4 divisors (see below), whose sum is σ = 1141743924368. Its totient is φ = 570871962180.

The previous prime is 856307943263. The next prime is 856307943287. The reversal of 856307943273 is 372349703658.

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 not a de Polignac number, because 856307943273 - 2⁸ = 856307943017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856307943203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142717990543 + ... + 142717990548.

It is an arithmetic number, because the mean of its divisors is an integer number (285435981092).

Almost surely, 2^856307943273 is an apocalyptic number.

It is an amenable number.

856307943273 is a deficient number, since it is larger than the sum of its proper divisors (285435981095).

856307943273 is a wasteful number, since it uses less digits than its factorization.

856307943273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285435981094.

The product of its (nonzero) digits is 22861440, while the sum is 57.

The spelling of 856307943273 in words is "eight hundred fifty-six billion, three hundred seven million, nine hundred forty-three thousand, two hundred seventy-three".