9709712308661 has 2 divisors, whose sum is σ = 9709712308662. Its totient is φ = 9709712308660.

The previous prime is 9709712308627. The next prime is 9709712308679. The reversal of 9709712308661 is 1668032179079.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5999099881636 + 3710612427025 = 2449306^2 + 1926295^2 .

It is a cyclic number.

It is not a de Polignac number, because 9709712308661 - 2¹⁴ = 9709712292277 is a prime.

It is a super-2 number, since 2×9709712308661² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9709712308661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9709712308601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4854856154330 + 4854856154331.

It is an arithmetic number, because the mean of its divisors is an integer number (4854856154331).

Almost surely, 2^{9709712308661} is an apocalyptic number.

It is an amenable number.

9709712308661 is a deficient number, since it is larger than the sum of its proper divisors (1).

9709712308661 is an equidigital number, since it uses as much as digits as its factorization.

9709712308661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6858432, while the sum is 59.

The spelling of 9709712308661 in words is "nine trillion, seven hundred nine billion, seven hundred twelve million, three hundred eight thousand, six hundred sixty-one".