18233118361 has 2 divisors, whose sum is σ = 18233118362. Its totient is φ = 18233118360.

The previous prime is 18233118269. The next prime is 18233118373. The reversal of 18233118361 is 16381133281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18208803600 + 24314761 = 134940^2 + 4931^2 .

It is an emirp because it is prime and its reverse (16381133281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18233118361 - 2¹¹ = 18233116313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18233118361.

It is not a weakly prime, because it can be changed into another prime (18233118461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9116559180 + 9116559181.

It is an arithmetic number, because the mean of its divisors is an integer number (9116559181).

Almost surely, 2^18233118361 is an apocalyptic number.

It is an amenable number.

18233118361 is a deficient number, since it is larger than the sum of its proper divisors (1).

18233118361 is an equidigital number, since it uses as much as digits as its factorization.

18233118361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The spelling of 18233118361 in words is "eighteen billion, two hundred thirty-three million, one hundred eighteen thousand, three hundred sixty-one".