871060855643856 has 120 divisors (see below), whose sum is σ = 2511665302231176. Its totient is φ = 281681480171520.

The previous prime is 871060855643819. The next prime is 871060855643911. The reversal of 871060855643856 is 658346558060178.

871060855643856 is a `hidden beast` number, since 8 + 7 + 1 + 0 + 6 + 0 + 8 + 5 + 564 + 3 + 8 + 56 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 900297345600 + 870160558298256 = 948840^2 + 29498484^2 .

It is a super-2 number, since 2×871060855643856² (a number of 31 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 678567585 + ... + 679850048.

Almost surely, 2^{871060855643856} is an apocalyptic number.

It is an amenable number.

871060855643856 is an abundant number, since it is smaller than the sum of its proper divisors (1640604446587320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

871060855643856 is a wasteful number, since it uses less digits than its factorization.

871060855643856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1358417781 (or 1358417772 counting only the distinct ones).

The product of its (nonzero) digits is 1161216000, while the sum is 72.

The spelling of 871060855643856 in words is "eight hundred seventy-one trillion, sixty billion, eight hundred fifty-five million, six hundred forty-three thousand, eight hundred fifty-six".