9665960091 has 4 divisors (see below), whose sum is σ = 12887946792. Its totient is φ = 6443973392.

The previous prime is 9665960071. The next prime is 9665960191. The reversal of 9665960091 is 1900695669.

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

It is a cyclic number.

It is not a de Polignac number, because 9665960091 - 2⁶ = 9665960027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9665960071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1610993346 + ... + 1610993351.

It is an arithmetic number, because the mean of its divisors is an integer number (3221986698).

Almost surely, 2^9665960091 is an apocalyptic number.

9665960091 is a deficient number, since it is larger than the sum of its proper divisors (3221986701).

9665960091 is a wasteful number, since it uses less digits than its factorization.

9665960091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3221986700.

The product of its (nonzero) digits is 787320, while the sum is 51.

The square root of 9665960091 is about 98315.6146855625. The cubic root of 9665960091 is about 2130.1736059429.

The spelling of 9665960091 in words is "nine billion, six hundred sixty-five million, nine hundred sixty thousand, ninety-one".