9667947991969 has 4 divisors (see below), whose sum is σ = 10236650815044. Its totient is φ = 9099245168896.

The previous prime is 9667947991963. The next prime is 9667947991979. The reversal of 9667947991969 is 9691997497669.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6499761588369 + 3168186403600 = 2549463^2 + 1779940^2 .

It is a cyclic number.

It is not a de Polignac number, because 9667947991969 - 2¹³ = 9667947983777 is a prime.

It is a super-2 number, since 2×9667947991969² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9667947991963) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 284351411512 + ... + 284351411545.

It is an arithmetic number, because the mean of its divisors is an integer number (2559162703761).

Almost surely, 2^{9667947991969} is an apocalyptic number.

It is an amenable number.

9667947991969 is a deficient number, since it is larger than the sum of its proper divisors (568702823075).

9667947991969 is a wasteful number, since it uses less digits than its factorization.

9667947991969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568702823074.

The product of its digits is 22499086176, while the sum is 91.

The spelling of 9667947991969 in words is "nine trillion, six hundred sixty-seven billion, nine hundred forty-seven million, nine hundred ninety-one thousand, nine hundred sixty-nine".