856536845 has 4 divisors (see below), whose sum is σ = 1027844220. Its totient is φ = 685229472.

The previous prime is 856536841. The next prime is 856536871. The reversal of 856536845 is 548635658.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 556346569 + 300190276 = 23587^2 + 17326^2 .

It is a cyclic number.

It is not a de Polignac number, because 856536845 - 2² = 856536841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 856536793 and 856536802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856536841) 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, 85653680 + ... + 85653689.

It is an arithmetic number, because the mean of its divisors is an integer number (256961055).

Almost surely, 2^856536845 is an apocalyptic number.

It is an amenable number.

856536845 is a deficient number, since it is larger than the sum of its proper divisors (171307375).

856536845 is a wasteful number, since it uses less digits than its factorization.

856536845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171307374.

The product of its digits is 3456000, while the sum is 50.

The square root of 856536845 is about 29266.6507308233. The cubic root of 856536845 is about 949.6903312021.

The spelling of 856536845 in words is "eight hundred fifty-six million, five hundred thirty-six thousand, eight hundred forty-five".