18276748121 has 2 divisors, whose sum is σ = 18276748122. Its totient is φ = 18276748120.

The previous prime is 18276748099. The next prime is 18276748123. The reversal of 18276748121 is 12184767281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17482128400 + 794619721 = 132220^2 + 28189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18276748121 is a prime.

Together with 18276748123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18276748123) 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, 9138374060 + 9138374061.

It is an arithmetic number, because the mean of its divisors is an integer number (9138374061).

Almost surely, 2^18276748121 is an apocalyptic number.

It is an amenable number.

18276748121 is a deficient number, since it is larger than the sum of its proper divisors (1).

18276748121 is an equidigital number, since it uses as much as digits as its factorization.

18276748121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 301056, while the sum is 47.

The spelling of 18276748121 in words is "eighteen billion, two hundred seventy-six million, seven hundred forty-eight thousand, one hundred twenty-one".