1668417601 has 2 divisors, whose sum is σ = 1668417602. Its totient is φ = 1668417600.

The previous prime is 1668417467. The next prime is 1668417617. The reversal of 1668417601 is 1067148661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1304943376 + 363474225 = 36124^2 + 19065^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668417601 - 2²⁷ = 1534199873 is a prime.

It is not a weakly prime, because it can be changed into another prime (1668457601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834208800 + 834208801.

It is an arithmetic number, because the mean of its divisors is an integer number (834208801).

Almost surely, 2^1668417601 is an apocalyptic number.

It is an amenable number.

1668417601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668417601 is an equidigital number, since it uses as much as digits as its factorization.

1668417601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 1668417601 is about 40846.2678956107. The cubic root of 1668417601 is about 1186.0461486270.

The spelling of 1668417601 in words is "one billion, six hundred sixty-eight million, four hundred seventeen thousand, six hundred one".