1918373738189 has 2 divisors, whose sum is σ = 1918373738190. Its totient is φ = 1918373738188.

The previous prime is 1918373738173. The next prime is 1918373738209. The reversal of 1918373738189 is 9818373738191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1918197300100 + 176438089 = 1384990^2 + 13283^2 .

It is an emirp because it is prime and its reverse (9818373738191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1918373738189 - 2⁴ = 1918373738173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1918373738089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959186869094 + 959186869095.

It is an arithmetic number, because the mean of its divisors is an integer number (959186869095).

Almost surely, 2^{1918373738189} is an apocalyptic number.

It is an amenable number.

1918373738189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918373738189 is an equidigital number, since it uses as much as digits as its factorization.

1918373738189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54867456, while the sum is 68.

It can be divided in two parts, 1918373 and 738189, that added together give a palindrome (2656562).

The spelling of 1918373738189 in words is "one trillion, nine hundred eighteen billion, three hundred seventy-three million, seven hundred thirty-eight thousand, one hundred eighty-nine".