123663181841 has 2 divisors, whose sum is σ = 123663181842. Its totient is φ = 123663181840.

The previous prime is 123663181757. The next prime is 123663181843. The reversal of 123663181841 is 148181366321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119954859025 + 3708322816 = 346345^2 + 60896^2 .

It is an emirp because it is prime and its reverse (148181366321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123663181841 is a prime.

Together with 123663181843, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 123663181792 and 123663181801.

It is not a weakly prime, because it can be changed into another prime (123663181843) 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, 61831590920 + 61831590921.

It is an arithmetic number, because the mean of its divisors is an integer number (61831590921).

Almost surely, 2^123663181841 is an apocalyptic number.

It is an amenable number.

123663181841 is a deficient number, since it is larger than the sum of its proper divisors (1).

123663181841 is an equidigital number, since it uses as much as digits as its factorization.

123663181841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 44.

The spelling of 123663181841 in words is "one hundred twenty-three billion, six hundred sixty-three million, one hundred eighty-one thousand, eight hundred forty-one".