1668703573 has 2 divisors, whose sum is σ = 1668703574. Its totient is φ = 1668703572.

The previous prime is 1668703507. The next prime is 1668703577. The reversal of 1668703573 is 3753078661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1025472529 + 643231044 = 32023^2 + 25362^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668703573 - 2¹⁷ = 1668572501 is a prime.

It is a super-2 number, since 2×1668703573² = 5569143229085932658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1668703577) 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, 834351786 + 834351787.

It is an arithmetic number, because the mean of its divisors is an integer number (834351787).

Almost surely, 2^1668703573 is an apocalyptic number.

It is an amenable number.

1668703573 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668703573 is an equidigital number, since it uses as much as digits as its factorization.

1668703573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 635040, while the sum is 46.

The square root of 1668703573 is about 40849.7683347164. The cubic root of 1668703573 is about 1186.1139087634.

The spelling of 1668703573 in words is "one billion, six hundred sixty-eight million, seven hundred three thousand, five hundred seventy-three".