8717421208873 has 6 divisors (see below), whose sum is σ = 9439574445294. Its totient is φ = 8046850346496.

The previous prime is 8717421208861. The next prime is 8717421208919. The reversal of 8717421208873 is 3788021247178.

It can be written as a sum of positive squares in 3 ways, for example, as 169358587024 + 8548062621849 = 411532^2 + 2923707^2 .

It is not a de Polignac number, because 8717421208873 - 2²⁵ = 8717387654441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8717421248873) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25791186840 + ... + 25791187177.

It is an arithmetic number, because the mean of its divisors is an integer number (1573262407549).

Almost surely, 2^{8717421208873} is an apocalyptic number.

It is an amenable number.

8717421208873 is a deficient number, since it is larger than the sum of its proper divisors (722153236421).

8717421208873 is a wasteful number, since it uses less digits than its factorization.

8717421208873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51582374043 (or 51582374030 counting only the distinct ones).

The product of its (nonzero) digits is 8429568, while the sum is 58.

The spelling of 8717421208873 in words is "eight trillion, seven hundred seventeen billion, four hundred twenty-one million, two hundred eight thousand, eight hundred seventy-three".