1669168217 has 2 divisors, whose sum is σ = 1669168218. Its totient is φ = 1669168216.

The previous prime is 1669168187. The next prime is 1669168223. The reversal of 1669168217 is 7128619661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1659829081 + 9339136 = 40741^2 + 3056^2 .

It is an emirp because it is prime and its reverse (7128619661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1669168217 - 2⁶ = 1669168153 is a prime.

It is a super-2 number, since 2×1669168217² = 5572245073285918178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1669168717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834584108 + 834584109.

It is an arithmetic number, because the mean of its divisors is an integer number (834584109).

Almost surely, 2^1669168217 is an apocalyptic number.

It is an amenable number.

1669168217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669168217 is an equidigital number, since it uses as much as digits as its factorization.

1669168217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 47.

The square root of 1669168217 is about 40855.4551681902. The cubic root of 1669168217 is about 1186.2239881438.

The spelling of 1669168217 in words is "one billion, six hundred sixty-nine million, one hundred sixty-eight thousand, two hundred seventeen".