1668850517 has 2 divisors, whose sum is σ = 1668850518. Its totient is φ = 1668850516.

The previous prime is 1668850507. The next prime is 1668850523. The reversal of 1668850517 is 7150588661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1657385521 + 11464996 = 40711^2 + 3386^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668850517 - 2⁶ = 1668850453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1668850507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834425258 + 834425259.

It is an arithmetic number, because the mean of its divisors is an integer number (834425259).

Almost surely, 2^1668850517 is an apocalyptic number.

It is an amenable number.

1668850517 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668850517 is an equidigital number, since it uses as much as digits as its factorization.

1668850517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 403200, while the sum is 47.

The square root of 1668850517 is about 40851.5668854941. The cubic root of 1668850517 is about 1186.1487236559.

The spelling of 1668850517 in words is "one billion, six hundred sixty-eight million, eight hundred fifty thousand, five hundred seventeen".