1668106669 has 2 divisors, whose sum is σ = 1668106670. Its totient is φ = 1668106668.

The previous prime is 1668106639. The next prime is 1668106681. The reversal of 1668106669 is 9666018661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1351444644 + 316662025 = 36762^2 + 17795^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668106669 - 2¹⁷ = 1667975597 is a prime.

It is a super-2 number, since 2×1668106669² = 5565159718324551122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1668106639) 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, 834053334 + 834053335.

It is an arithmetic number, because the mean of its divisors is an integer number (834053335).

Almost surely, 2^1668106669 is an apocalyptic number.

It is an amenable number.

1668106669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668106669 is an equidigital number, since it uses as much as digits as its factorization.

1668106669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 1668106669 is about 40842.4615932977. The cubic root of 1668106669 is about 1185.9724655131.

The spelling of 1668106669 in words is "one billion, six hundred sixty-eight million, one hundred six thousand, six hundred sixty-nine".