999713856834 has 128 divisors (see below), whose sum is σ = 2779560437760. Its totient is φ = 258748084800.

The previous prime is 999713856833. The next prime is 999713856859. The reversal of 999713856834 is 438658317999.

999713856834 is a `hidden beast` number, since 9 + 99 + 71 + 385 + 68 + 34 = 666.

999713856834 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×999713856834² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (999713856833) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 751924 + ... + 1601504.

It is an arithmetic number, because the mean of its divisors is an integer number (21715315920).

Almost surely, 2^999713856834 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999713856834, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1389780218880).

999713856834 is an abundant number, since it is smaller than the sum of its proper divisors (1779846580926).

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

999713856834 is a wasteful number, since it uses less digits than its factorization.

999713856834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849893 (or 849887 counting only the distinct ones).

The product of its digits is 352719360, while the sum is 72.

It can be divided in two parts, 9997 and 13856834, that added together give a palindrome (13866831).

The spelling of 999713856834 in words is "nine hundred ninety-nine billion, seven hundred thirteen million, eight hundred fifty-six thousand, eight hundred thirty-four".