1918373738089 has 2 divisors, whose sum is σ = 1918373738090. Its totient is φ = 1918373738088.

The previous prime is 1918373738063. The next prime is 1918373738117. The reversal of 1918373738089 is 9808373738191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1796851778089 + 121521960000 = 1340467^2 + 348600^2 .

It is a cyclic number.

It is not a de Polignac number, because 1918373738089 - 2²⁷ = 1918239520361 is a prime.

It is not a weakly prime, because it can be changed into another prime (1918373738189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959186869044 + 959186869045.

It is an arithmetic number, because the mean of its divisors is an integer number (959186869045).

Almost surely, 2^{1918373738089} is an apocalyptic number.

It is an amenable number.

1918373738089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918373738089 is an equidigital number, since it uses as much as digits as its factorization.

1918373738089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54867456, while the sum is 67.

The spelling of 1918373738089 in words is "one trillion, nine hundred eighteen billion, three hundred seventy-three million, seven hundred thirty-eight thousand, eighty-nine".