12163661 has 2 divisors, whose sum is σ = 12163662. Its totient is φ = 12163660.

The previous prime is 12163621. The next prime is 12163663. The reversal of 12163661 is 16636121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10118761 + 2044900 = 3181^2 + 1430^2 .

It is an emirp because it is prime and its reverse (16636121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12163661 - 2⁶ = 12163597 is a prime.

Together with 12163663, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12163661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12163663) 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, 6081830 + 6081831.

It is an arithmetic number, because the mean of its divisors is an integer number (6081831).

Almost surely, 2^12163661 is an apocalyptic number.

It is an amenable number.

12163661 is a deficient number, since it is larger than the sum of its proper divisors (1).

12163661 is an equidigital number, since it uses as much as digits as its factorization.

12163661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 26.

The square root of 12163661 is about 3487.6440472044. The cubic root of 12163661 is about 229.9789583775.

Adding to 12163661 its reverse (16636121), we get a palindrome (28799782).

The spelling of 12163661 in words is "twelve million, one hundred sixty-three thousand, six hundred sixty-one".