1668343447 has 2 divisors, whose sum is σ = 1668343448. Its totient is φ = 1668343446.

The previous prime is 1668343429. The next prime is 1668343471. The reversal of 1668343447 is 7443438661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1668343447 - 2²³ = 1659954839 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1668343397 and 1668343406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1668343477) 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, 834171723 + 834171724.

It is an arithmetic number, because the mean of its divisors is an integer number (834171724).

Almost surely, 2^1668343447 is an apocalyptic number.

1668343447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668343447 is an equidigital number, since it uses as much as digits as its factorization.

1668343447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 46.

The square root of 1668343447 is about 40845.3601648951. The cubic root of 1668343447 is about 1186.0285768134.

The spelling of 1668343447 in words is "one billion, six hundred sixty-eight million, three hundred forty-three thousand, four hundred forty-seven".