1666116307 has 2 divisors, whose sum is σ = 1666116308. Its totient is φ = 1666116306.

The previous prime is 1666116239. The next prime is 1666116349. The reversal of 1666116307 is 7036116661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1666116307 - 2¹⁵ = 1666083539 is a prime.

It is not a weakly prime, because it can be changed into another prime (1666116007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833058153 + 833058154.

It is an arithmetic number, because the mean of its divisors is an integer number (833058154).

Almost surely, 2^1666116307 is an apocalyptic number.

1666116307 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666116307 is an equidigital number, since it uses as much as digits as its factorization.

1666116307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 1666116307 is about 40818.0879880477. The cubic root of 1666116307 is about 1185.5005824216.

The spelling of 1666116307 in words is "one billion, six hundred sixty-six million, one hundred sixteen thousand, three hundred seven".