1666350017 has 2 divisors, whose sum is σ = 1666350018. Its totient is φ = 1666350016.

The previous prime is 1666349987. The next prime is 1666350031. The reversal of 1666350017 is 7100536661.

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., 1526543041 + 139806976 = 39071^2 + 11824^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666350017 - 2⁶ = 1666349953 is a prime.

It is not a weakly prime, because it can be changed into another prime (1666350067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833175008 + 833175009.

It is an arithmetic number, because the mean of its divisors is an integer number (833175009).

Almost surely, 2^1666350017 is an apocalyptic number.

It is an amenable number.

1666350017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666350017 is an equidigital number, since it uses as much as digits as its factorization.

1666350017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 1666350017 is about 40820.9507116138. The cubic root of 1666350017 is about 1185.5560108024.

Adding to 1666350017 its reverse (7100536661), we get a palindrome (8766886678).

The spelling of 1666350017 in words is "one billion, six hundred sixty-six million, three hundred fifty thousand, seventeen".