1666316347 has 2 divisors, whose sum is σ = 1666316348. Its totient is φ = 1666316346.

The previous prime is 1666316339. The next prime is 1666316357. The reversal of 1666316347 is 7436136661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1666316347 - 2³ = 1666316339 is a prime.

It is a super-2 number, since 2×1666316347² = 5553220336558848818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1666316317) 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, 833158173 + 833158174.

It is an arithmetic number, because the mean of its divisors is an integer number (833158174).

Almost surely, 2^1666316347 is an apocalyptic number.

1666316347 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666316347 is an equidigital number, since it uses as much as digits as its factorization.

1666316347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 43.

The square root of 1666316347 is about 40820.5382987535. The cubic root of 1666316347 is about 1185.5480256973.

The spelling of 1666316347 in words is "one billion, six hundred sixty-six million, three hundred sixteen thousand, three hundred forty-seven".