1066774851809 has 2 divisors, whose sum is σ = 1066774851810. Its totient is φ = 1066774851808.

The previous prime is 1066774851799. The next prime is 1066774851811. The reversal of 1066774851809 is 9081584776601.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 856185641809 + 210589210000 = 925303^2 + 458900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1066774851809 is a prime.

It is a super-2 number, since 2×1066774851809² (a number of 25 digits) contains 22 as substring.

Together with 1066774851811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1066774851839) 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, 533387425904 + 533387425905.

It is an arithmetic number, because the mean of its divisors is an integer number (533387425905).

Almost surely, 2^{1066774851809} is an apocalyptic number.

It is an amenable number.

1066774851809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1066774851809 is an equidigital number, since it uses as much as digits as its factorization.

1066774851809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20321280, while the sum is 62.

The spelling of 1066774851809 in words is "one trillion, sixty-six billion, seven hundred seventy-four million, eight hundred fifty-one thousand, eight hundred nine".