9661039748609 has 2 divisors, whose sum is σ = 9661039748610. Its totient is φ = 9661039748608.

The previous prime is 9661039748587. The next prime is 9661039748653. The reversal of 9661039748609 is 9068479301669.

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., 8189784768400 + 1471254980209 = 2861780^2 + 1212953^2 .

It is a cyclic number.

It is not a de Polignac number, because 9661039748609 - 2¹⁶ = 9661039683073 is a prime.

It is not a weakly prime, because it can be changed into another prime (9661039748309) 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, 4830519874304 + 4830519874305.

It is an arithmetic number, because the mean of its divisors is an integer number (4830519874305).

Almost surely, 2^{9661039748609} is an apocalyptic number.

It is an amenable number.

9661039748609 is a deficient number, since it is larger than the sum of its proper divisors (1).

9661039748609 is an equidigital number, since it uses as much as digits as its factorization.

9661039748609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105815808, while the sum is 68.

The spelling of 9661039748609 in words is "nine trillion, six hundred sixty-one billion, thirty-nine million, seven hundred forty-eight thousand, six hundred nine".