9656814979521 has 12 divisors (see below), whose sum is σ = 14273121882448. Its totient is φ = 6288158591064.

The previous prime is 9656814979477. The next prime is 9656814979529. The reversal of 9656814979521 is 1259794186569.

9656814979521 is a `hidden beast` number, since 9 + 6 + 5 + 6 + 8 + 1 + 4 + 97 + 9 + 521 = 666.

It is not a de Polignac number, because 9656814979521 - 2¹⁰ = 9656814978497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9656814979521.

It is not an unprimeable number, because it can be changed into a prime (9656814979529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12476504755 + ... + 12476505528.

Almost surely, 2^{9656814979521} is an apocalyptic number.

It is an amenable number.

9656814979521 is a deficient number, since it is larger than the sum of its proper divisors (4616306902927).

9656814979521 is a wasteful number, since it uses less digits than its factorization.

9656814979521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24953010332 (or 24953010329 counting only the distinct ones).

The product of its digits is 293932800, while the sum is 72.

The spelling of 9656814979521 in words is "nine trillion, six hundred fifty-six billion, eight hundred fourteen million, nine hundred seventy-nine thousand, five hundred twenty-one".