12123187183661 has 2 divisors, whose sum is σ = 12123187183662. Its totient is φ = 12123187183660.

The previous prime is 12123187183649. The next prime is 12123187183693. The reversal of 12123187183661 is 16638178132121.

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., 11360742124900 + 762445058761 = 3370570^2 + 873181^2 .

It is a cyclic number.

It is not a de Polignac number, because 12123187183661 - 2³⁴ = 12106007314477 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12123187186661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061593591830 + 6061593591831.

It is an arithmetic number, because the mean of its divisors is an integer number (6061593591831).

Almost surely, 2^{12123187183661} is an apocalyptic number.

It is an amenable number.

12123187183661 is a deficient number, since it is larger than the sum of its proper divisors (1).

12123187183661 is an equidigital number, since it uses as much as digits as its factorization.

12123187183661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 50.

The spelling of 12123187183661 in words is "twelve trillion, one hundred twenty-three billion, one hundred eighty-seven million, one hundred eighty-three thousand, six hundred sixty-one".