9661331669 has 4 divisors (see below), whose sum is σ = 10539634560. Its totient is φ = 8783028780.

The previous prime is 9661331651. The next prime is 9661331671.

It is a happy number.

9661331669 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9661331669 - 2²⁰ = 9660283093 is a prime.

It is a super-2 number, since 2×9661331669² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9661337669) 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, 439151429 + ... + 439151450.

It is an arithmetic number, because the mean of its divisors is an integer number (2634908640).

Almost surely, 2^9661331669 is an apocalyptic number.

It is an amenable number.

9661331669 is a deficient number, since it is larger than the sum of its proper divisors (878302891).

9661331669 is a wasteful number, since it uses less digits than its factorization.

9661331669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878302890.

The product of its digits is 944784, while the sum is 50.

The square root of 9661331669 is about 98292.0732765364. The cubic root of 9661331669 is about 2129.8335494842.

The spelling of 9661331669 in words is "nine billion, six hundred sixty-one million, three hundred thirty-one thousand, six hundred sixty-nine".