9659570679721 has 4 divisors (see below), whose sum is σ = 9660215999700. Its totient is φ = 9658925359744.

The previous prime is 9659570679709. The next prime is 9659570679823. The reversal of 9659570679721 is 1279760759569.

9659570679721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2246584297321 + 7412986382400 = 1498861^2 + 2722680^2 .

It is a cyclic number.

It is not a de Polignac number, because 9659570679721 - 2⁷ = 9659570679593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9659570670721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322637536 + ... + 322667473.

It is an arithmetic number, because the mean of its divisors is an integer number (2415053999925).

Almost surely, 2^{9659570679721} is an apocalyptic number.

It is an amenable number.

9659570679721 is a deficient number, since it is larger than the sum of its proper divisors (645319979).

9659570679721 is a wasteful number, since it uses less digits than its factorization.

9659570679721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645319978.

The product of its (nonzero) digits is 450084600, while the sum is 73.

The spelling of 9659570679721 in words is "nine trillion, six hundred fifty-nine billion, five hundred seventy million, six hundred seventy-nine thousand, seven hundred twenty-one".