9971718256 has 40 divisors (see below), whose sum is σ = 19606852224. Its totient is φ = 4911990720.

The previous prime is 9971718233. The next prime is 9971718257. The reversal of 9971718256 is 6528171799.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 9971718197 and 9971718206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9971718257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2164051 + ... + 2168653.

Almost surely, 2^9971718256 is an apocalyptic number.

It is an amenable number.

9971718256 is a deficient number, since it is larger than the sum of its proper divisors (9635133968).

9971718256 is a wasteful number, since it uses less digits than its factorization.

9971718256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6589 (or 6583 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 55.

The square root of 9971718256 is about 99858.4911562357. The cubic root of 9971718256 is about 2152.4017332947.

The spelling of 9971718256 in words is "nine billion, nine hundred seventy-one million, seven hundred eighteen thousand, two hundred fifty-six".