1166345861 has 2 divisors, whose sum is σ = 1166345862. Its totient is φ = 1166345860.

The previous prime is 1166345833. The next prime is 1166345933. The reversal of 1166345861 is 1685436611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1158108961 + 8236900 = 34031^2 + 2870^2 .

It is an emirp because it is prime and its reverse (1685436611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1166345861 - 2¹⁸ = 1166083717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1166315861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583172930 + 583172931.

It is an arithmetic number, because the mean of its divisors is an integer number (583172931).

Almost surely, 2^1166345861 is an apocalyptic number.

It is an amenable number.

1166345861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166345861 is an equidigital number, since it uses as much as digits as its factorization.

1166345861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 41.

The square root of 1166345861 is about 34151.8061162217. The cubic root of 1166345861 is about 1052.6300991470.

The spelling of 1166345861 in words is "one billion, one hundred sixty-six million, three hundred forty-five thousand, eight hundred sixty-one".