1666833351811 has 2 divisors, whose sum is σ = 1666833351812. Its totient is φ = 1666833351810.

The previous prime is 1666833351761. The next prime is 1666833351881. The reversal of 1666833351811 is 1181533386661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1666833351811 - 2²³ = 1666824963203 is a prime.

It is not a weakly prime, because it can be changed into another prime (1666833351881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833416675905 + 833416675906.

It is an arithmetic number, because the mean of its divisors is an integer number (833416675906).

Almost surely, 2^{1666833351811} is an apocalyptic number.

1666833351811 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666833351811 is an equidigital number, since it uses as much as digits as its factorization.

1666833351811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 52.

The spelling of 1666833351811 in words is "one trillion, six hundred sixty-six billion, eight hundred thirty-three million, three hundred fifty-one thousand, eight hundred eleven".