856471855563 has 24 divisors (see below), whose sum is σ = 1282659096576. Its totient is φ = 550128250800.

The previous prime is 856471855553. The next prime is 856471855567. The reversal of 856471855563 is 365558174658.

856471855563 is a `hidden beast` number, since 8 + 5 + 6 + 4 + 7 + 18 + 55 + 563 = 666.

It is not a de Polignac number, because 856471855563 - 2⁹ = 856471855051 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 856471855563.

It is not an unprimeable number, because it can be changed into a prime (856471855567) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6698323 + ... + 6824988.

It is an arithmetic number, because the mean of its divisors is an integer number (53444129024).

Almost surely, 2^856471855563 is an apocalyptic number.

856471855563 is a deficient number, since it is larger than the sum of its proper divisors (426187241013).

856471855563 is a wasteful number, since it uses less digits than its factorization.

856471855563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13523575 (or 13523572 counting only the distinct ones).

The product of its digits is 120960000, while the sum is 63.

The spelling of 856471855563 in words is "eight hundred fifty-six billion, four hundred seventy-one million, eight hundred fifty-five thousand, five hundred sixty-three".