18938271362249 has 2 divisors, whose sum is σ = 18938271362250. Its totient is φ = 18938271362248.

The previous prime is 18938271362221. The next prime is 18938271362317. The reversal of 18938271362249 is 94226317283981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18704266974649 + 234004387600 = 4324843^2 + 483740^2 .

It is a cyclic number.

It is not a de Polignac number, because 18938271362249 - 2¹⁶ = 18938271296713 is a prime.

It is not a weakly prime, because it can be changed into another prime (18938271332249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9469135681124 + 9469135681125.

It is an arithmetic number, because the mean of its divisors is an integer number (9469135681125).

Almost surely, 2^{18938271362249} is an apocalyptic number.

It is an amenable number.

18938271362249 is a deficient number, since it is larger than the sum of its proper divisors (1).

18938271362249 is an equidigital number, since it uses as much as digits as its factorization.

18938271362249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62705664, while the sum is 65.

The spelling of 18938271362249 in words is "eighteen trillion, nine hundred thirty-eight billion, two hundred seventy-one million, three hundred sixty-two thousand, two hundred forty-nine".