9665816664 has 32 divisors (see below), whose sum is σ = 27616619520. Its totient is φ = 2761661856.

The previous prime is 9665816663. The next prime is 9665816669. The reversal of 9665816664 is 4666185669.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9665816663) 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, 28767144 + ... + 28767479.

It is an arithmetic number, because the mean of its divisors is an integer number (863019360).

Almost surely, 2^9665816664 is an apocalyptic number.

It is an amenable number.

9665816664 is an abundant number, since it is smaller than the sum of its proper divisors (17950802856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9665816664 is a wasteful number, since it uses less digits than its factorization.

9665816664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57534639 (or 57534635 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 57.

The square root of 9665816664 is about 98314.8852615920. The cubic root of 9665816664 is about 2130.1630697961.

The spelling of 9665816664 in words is "nine billion, six hundred sixty-five million, eight hundred sixteen thousand, six hundred sixty-four".