816913847718 has 64 divisors (see below), whose sum is σ = 1849563633600. Its totient is φ = 267222412800.

The previous prime is 816913847657. The next prime is 816913847719. The reversal of 816913847718 is 817748319618.

816913847718 is a `hidden beast` number, since 8 + 16 + 9 + 138 + 477 + 18 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816913847719) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46453 + ... + 1279056.

It is an arithmetic number, because the mean of its divisors is an integer number (28899431775).

Almost surely, 2^816913847718 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 816913847718, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (924781816800).

816913847718 is an abundant number, since it is smaller than the sum of its proper divisors (1032649785882).

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

816913847718 is a wasteful number, since it uses less digits than its factorization.

816913847718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1325734 (or 1325728 counting only the distinct ones).

The product of its digits is 16257024, while the sum is 63.

The spelling of 816913847718 in words is "eight hundred sixteen billion, nine hundred thirteen million, eight hundred forty-seven thousand, seven hundred eighteen".