1668426047 has 2 divisors, whose sum is σ = 1668426048. Its totient is φ = 1668426046.

The previous prime is 1668425981. The next prime is 1668426059. The reversal of 1668426047 is 7406248661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1668426047 - 2⁸ = 1668425791 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1668425989 and 1668426007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1668426247) 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, 834213023 + 834213024.

It is an arithmetic number, because the mean of its divisors is an integer number (834213024).

Almost surely, 2^1668426047 is an apocalyptic number.

1668426047 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668426047 is an equidigital number, since it uses as much as digits as its factorization.

1668426047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 44.

The square root of 1668426047 is about 40846.3712831385. The cubic root of 1668426047 is about 1186.0481499902.

The spelling of 1668426047 in words is "one billion, six hundred sixty-eight million, four hundred twenty-six thousand, forty-seven".