1666371133243 has 2 divisors, whose sum is σ = 1666371133244. Its totient is φ = 1666371133242.

The previous prime is 1666371133241. The next prime is 1666371133277. The reversal of 1666371133243 is 3423311736661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1666371133243 - 2¹ = 1666371133241 is a prime.

Together with 1666371133241, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1666371133193 and 1666371133202.

It is not a weakly prime, because it can be changed into another prime (1666371133241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833185566621 + 833185566622.

It is an arithmetic number, because the mean of its divisors is an integer number (833185566622).

Almost surely, 2^{1666371133243} is an apocalyptic number.

1666371133243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666371133243 is an equidigital number, since it uses as much as digits as its factorization.

1666371133243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 46.

The spelling of 1666371133243 in words is "one trillion, six hundred sixty-six billion, three hundred seventy-one million, one hundred thirty-three thousand, two hundred forty-three".