9666901902173 has 2 divisors, whose sum is σ = 9666901902174. Its totient is φ = 9666901902172.

The previous prime is 9666901902167. The next prime is 9666901902221. The reversal of 9666901902173 is 3712091096669.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7780679835769 + 1886222066404 = 2789387^2 + 1373398^2 .

It is an emirp because it is prime and its reverse (3712091096669) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9666901902173 - 2¹⁰ = 9666901901149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9666901905173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4833450951086 + 4833450951087.

It is an arithmetic number, because the mean of its divisors is an integer number (4833450951087).

Almost surely, 2^{9666901902173} is an apocalyptic number.

It is an amenable number.

9666901902173 is a deficient number, since it is larger than the sum of its proper divisors (1).

9666901902173 is an equidigital number, since it uses as much as digits as its factorization.

9666901902173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6613488, while the sum is 59.

The spelling of 9666901902173 in words is "nine trillion, six hundred sixty-six billion, nine hundred one million, nine hundred two thousand, one hundred seventy-three".