1668055717 has 2 divisors, whose sum is σ = 1668055718. Its totient is φ = 1668055716.

The previous prime is 1668055681. The next prime is 1668055723. The reversal of 1668055717 is 7175508661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1524199681 + 143856036 = 39041^2 + 11994^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668055717 - 2¹¹ = 1668053669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1668055787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834027858 + 834027859.

It is an arithmetic number, because the mean of its divisors is an integer number (834027859).

Almost surely, 2^1668055717 is an apocalyptic number.

It is an amenable number.

1668055717 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668055717 is an equidigital number, since it uses as much as digits as its factorization.

1668055717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 352800, while the sum is 46.

The square root of 1668055717 is about 40841.8378259353. The cubic root of 1668055717 is about 1185.9603902892.

The spelling of 1668055717 in words is "one billion, six hundred sixty-eight million, fifty-five thousand, seven hundred seventeen".