9664791793409 has 2 divisors, whose sum is σ = 9664791793410. Its totient is φ = 9664791793408.

The previous prime is 9664791793381. The next prime is 9664791793537. The reversal of 9664791793409 is 9043971974669.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5868763037809 + 3796028755600 = 2422553^2 + 1948340^2 .

It is a cyclic number.

It is not a de Polignac number, because 9664791793409 - 2¹⁶ = 9664791727873 is a prime.

It is not a weakly prime, because it can be changed into another prime (9664791795409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4832395896704 + 4832395896705.

It is an arithmetic number, because the mean of its divisors is an integer number (4832395896705).

Almost surely, 2^{9664791793409} is an apocalyptic number.

It is an amenable number.

9664791793409 is a deficient number, since it is larger than the sum of its proper divisors (1).

9664791793409 is an equidigital number, since it uses as much as digits as its factorization.

9664791793409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 555532992, while the sum is 74.

The spelling of 9664791793409 in words is "nine trillion, six hundred sixty-four billion, seven hundred ninety-one million, seven hundred ninety-three thousand, four hundred nine".