1811073771817 has 2 divisors, whose sum is σ = 1811073771818. Its totient is φ = 1811073771816.

The previous prime is 1811073771797. The next prime is 1811073771827. The reversal of 1811073771817 is 7181773701181.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1765467606681 + 45606165136 = 1328709^2 + 213556^2 .

It is a cyclic number.

It is not a de Polignac number, because 1811073771817 - 2³⁵ = 1776714033449 is a prime.

It is not a weakly prime, because it can be changed into another prime (1811073771827) 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, 905536885908 + 905536885909.

It is an arithmetic number, because the mean of its divisors is an integer number (905536885909).

Almost surely, 2^{1811073771817} is an apocalyptic number.

It is an amenable number.

1811073771817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1811073771817 is an equidigital number, since it uses as much as digits as its factorization.

1811073771817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 460992, while the sum is 52.

The spelling of 1811073771817 in words is "one trillion, eight hundred eleven billion, seventy-three million, seven hundred seventy-one thousand, eight hundred seventeen".