1918826985893 has 2 divisors, whose sum is σ = 1918826985894. Its totient is φ = 1918826985892.

The previous prime is 1918826985869. The next prime is 1918826985919. The reversal of 1918826985893 is 3985896288191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1872472034689 + 46354951204 = 1368383^2 + 215302^2 .

It is a cyclic number.

It is not a de Polignac number, because 1918826985893 - 2¹⁶ = 1918826920357 is a prime.

It is a super-3 number, since 3×1918826985893³ (a number of 38 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1918856985893) 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, 959413492946 + 959413492947.

It is an arithmetic number, because the mean of its divisors is an integer number (959413492947).

Almost surely, 2^{1918826985893} is an apocalyptic number.

It is an amenable number.

1918826985893 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918826985893 is an equidigital number, since it uses as much as digits as its factorization.

1918826985893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 537477120, while the sum is 77.

The spelling of 1918826985893 in words is "one trillion, nine hundred eighteen billion, eight hundred twenty-six million, nine hundred eighty-five thousand, eight hundred ninety-three".