9665671721496 has 64 divisors (see below), whose sum is σ = 27617149908480. Its totient is φ = 2761525992960.

The previous prime is 9665671721483. The next prime is 9665671721507. The reversal of 9665671721496 is 6941271765669.

It is a self number, because there is not a number n which added to its sum of digits gives 9665671721496.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4015200 + ... + 5954256.

It is an arithmetic number, because the mean of its divisors is an integer number (431517967320).

Almost surely, 2^{9665671721496} is an apocalyptic number.

It is an amenable number.

9665671721496 is an abundant number, since it is smaller than the sum of its proper divisors (17951478186984).

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

9665671721496 is a wasteful number, since it uses less digits than its factorization.

9665671721496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1968744 (or 1968740 counting only the distinct ones).

The product of its digits is 205752960, while the sum is 69.

The spelling of 9665671721496 in words is "nine trillion, six hundred sixty-five billion, six hundred seventy-one million, seven hundred twenty-one thousand, four hundred ninety-six".