9664747997 has 2 divisors, whose sum is σ = 9664747998. Its totient is φ = 9664747996.

The previous prime is 9664747949. The next prime is 9664748087. The reversal of 9664747997 is 7997474669.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9222529156 + 442218841 = 96034^2 + 21029^2 .

It is a cyclic number.

It is not a de Polignac number, because 9664747997 - 2¹⁴ = 9664731613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9664747297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4832373998 + 4832373999.

It is an arithmetic number, because the mean of its divisors is an integer number (4832373999).

Almost surely, 2^9664747997 is an apocalyptic number.

It is an amenable number.

9664747997 is a deficient number, since it is larger than the sum of its proper divisors (1).

9664747997 is an equidigital number, since it uses as much as digits as its factorization.

9664747997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144027072, while the sum is 68.

The square root of 9664747997 is about 98309.4501917288. The cubic root of 9664747997 is about 2130.0845622419.

The spelling of 9664747997 in words is "nine billion, six hundred sixty-four million, seven hundred forty-seven thousand, nine hundred ninety-seven".