999971004256 has 96 divisors (see below), whose sum is σ = 2273170798080. Its totient is φ = 424138208256.

The previous prime is 999971004247. The next prime is 999971004257. The reversal of 999971004256 is 652400179999.

It is a super-2 number, since 2×999971004256² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 999971004194 and 999971004203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999971004257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40294380 + ... + 40319188.

It is an arithmetic number, because the mean of its divisors is an integer number (23678862480).

Almost surely, 2^999971004256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999971004256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1136585399040).

999971004256 is an abundant number, since it is smaller than the sum of its proper divisors (1273199793824).

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

999971004256 is a wasteful number, since it uses less digits than its factorization.

999971004256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26676 (or 26668 counting only the distinct ones).

The product of its (nonzero) digits is 11022480, while the sum is 61.

The spelling of 999971004256 in words is "nine hundred ninety-nine billion, nine hundred seventy-one million, four thousand, two hundred fifty-six".