1668738307 has 2 divisors, whose sum is σ = 1668738308. Its totient is φ = 1668738306.

The previous prime is 1668738301. The next prime is 1668738349. The reversal of 1668738307 is 7038378661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1668738307 - 2⁷ = 1668738179 is a prime.

It is not a weakly prime, because it can be changed into another prime (1668738301) 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, 834369153 + 834369154.

It is an arithmetic number, because the mean of its divisors is an integer number (834369154).

Almost surely, 2^1668738307 is an apocalyptic number.

1668738307 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668738307 is an equidigital number, since it uses as much as digits as its factorization.

1668738307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1016064, while the sum is 49.

The square root of 1668738307 is about 40850.1934756740. The cubic root of 1668738307 is about 1186.1221383446.

The spelling of 1668738307 in words is "one billion, six hundred sixty-eight million, seven hundred thirty-eight thousand, three hundred seven".