9641994976658 has 54 divisors (see below), whose sum is σ = 16466818212117. Its totient is φ = 4230981751920.

The previous prime is 9641994976643. The next prime is 9641994976709. The reversal of 9641994976658 is 8566794991469.

It can be written as a sum of positive squares in 2 ways, for example, as 9636262518289 + 5732458369 = 3104233^2 + 75713^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=2195677.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1400838485 + ... + 1400845367.

Almost surely, 2^{9641994976658} is an apocalyptic number.

9641994976658 is a deficient number, since it is larger than the sum of its proper divisors (6824823235459).

9641994976658 is an frugal number, since it uses more digits than its factorization.

9641994976658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13848 (or 6925 counting only the distinct ones).

The product of its digits is 6348948480, while the sum is 83.

The spelling of 9641994976658 in words is "nine trillion, six hundred forty-one billion, nine hundred ninety-four million, nine hundred seventy-six thousand, six hundred fifty-eight".