1666850041 has 2 divisors, whose sum is σ = 1666850042. Its totient is φ = 1666850040.

The previous prime is 1666850033. The next prime is 1666850057. The reversal of 1666850041 is 1400586661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 876396816 + 790453225 = 29604^2 + 28115^2 .

It is an emirp because it is prime and its reverse (1400586661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1666850041 - 2³ = 1666850033 is a prime.

It is not a weakly prime, because it can be changed into another prime (1666850011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833425020 + 833425021.

It is an arithmetic number, because the mean of its divisors is an integer number (833425021).

Almost surely, 2^1666850041 is an apocalyptic number.

It is an amenable number.

1666850041 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666850041 is an equidigital number, since it uses as much as digits as its factorization.

1666850041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 1666850041 is about 40827.0748523575. The cubic root of 1666850041 is about 1185.6745827646.

The spelling of 1666850041 in words is "one billion, six hundred sixty-six million, eight hundred fifty thousand, forty-one".