871815481722 has 64 divisors (see below), whose sum is σ = 2008159776000. Its totient is φ = 280026218304.

The previous prime is 871815481721. The next prime is 871815481729. The reversal of 871815481722 is 227184518178.

871815481722 is a `hidden beast` number, since 8 + 7 + 1 + 81 + 548 + 17 + 2 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (871815481721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 234304 + ... + 1341092.

It is an arithmetic number, because the mean of its divisors is an integer number (31377496500).

Almost surely, 2^871815481722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 871815481722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1004079888000).

871815481722 is an abundant number, since it is smaller than the sum of its proper divisors (1136344294278).

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

871815481722 is a wasteful number, since it uses less digits than its factorization.

871815481722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107332 (or 1107326 counting only the distinct ones).

The product of its digits is 2007040, while the sum is 54.

The spelling of 871815481722 in words is "eight hundred seventy-one billion, eight hundred fifteen million, four hundred eighty-one thousand, seven hundred twenty-two".