9665193661 has 2 divisors, whose sum is σ = 9665193662. Its totient is φ = 9665193660.

The previous prime is 9665193569. The next prime is 9665193673. The reversal of 9665193661 is 1663915669.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9664856100 + 337561 = 98310^2 + 581^2 .

It is a cyclic number.

It is not a de Polignac number, because 9665193661 - 2⁹ = 9665193149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9665193599 and 9665193608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9665191661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4832596830 + 4832596831.

It is an arithmetic number, because the mean of its divisors is an integer number (4832596831).

Almost surely, 2^9665193661 is an apocalyptic number.

It is an amenable number.

9665193661 is a deficient number, since it is larger than the sum of its proper divisors (1).

9665193661 is an equidigital number, since it uses as much as digits as its factorization.

9665193661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1574640, while the sum is 52.

The square root of 9665193661 is about 98311.7168042548. The cubic root of 9665193661 is about 2130.1173027892.

The spelling of 9665193661 in words is "nine billion, six hundred sixty-five million, one hundred ninety-three thousand, six hundred sixty-one".