1331666033 has 2 divisors, whose sum is σ = 1331666034. Its totient is φ = 1331666032.

The previous prime is 1331665987. The next prime is 1331666041. The reversal of 1331666033 is 3306661331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1201523569 + 130142464 = 34663^2 + 11408^2 .

It is an emirp because it is prime and its reverse (3306661331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1331666033 - 2¹⁰ = 1331665009 is a prime.

It is not a weakly prime, because it can be changed into another prime (1331666333) 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, 665833016 + 665833017.

It is an arithmetic number, because the mean of its divisors is an integer number (665833017).

Almost surely, 2^1331666033 is an apocalyptic number.

It is an amenable number.

1331666033 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331666033 is an equidigital number, since it uses as much as digits as its factorization.

1331666033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 32.

The square root of 1331666033 is about 36491.9995752494. Note that the first 3 decimals coincide. The cubic root of 1331666033 is about 1100.1834495693.

The spelling of 1331666033 in words is "one billion, three hundred thirty-one million, six hundred sixty-six thousand, thirty-three".