12195526661 has 2 divisors, whose sum is σ = 12195526662. Its totient is φ = 12195526660.

The previous prime is 12195526639. The next prime is 12195526669. The reversal of 12195526661 is 16662559121.

12195526661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11514577636 + 680949025 = 107306^2 + 26095^2 .

It is a cyclic number.

It is not a de Polignac number, because 12195526661 - 2⁶ = 12195526597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12195526669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6097763330 + 6097763331.

It is an arithmetic number, because the mean of its divisors is an integer number (6097763331).

Almost surely, 2^12195526661 is an apocalyptic number.

It is an amenable number.

12195526661 is a deficient number, since it is larger than the sum of its proper divisors (1).

12195526661 is an equidigital number, since it uses as much as digits as its factorization.

12195526661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 44.

The spelling of 12195526661 in words is "twelve billion, one hundred ninety-five million, five hundred twenty-six thousand, six hundred sixty-one".