1666683317129 has 2 divisors, whose sum is σ = 1666683317130. Its totient is φ = 1666683317128.

The previous prime is 1666683317083. The next prime is 1666683317147. The reversal of 1666683317129 is 9217133866661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 995758507129 + 670924810000 = 997877^2 + 819100^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666683317129 - 2⁸ = 1666683316873 is a prime.

It is a super-2 number, since 2×1666683317129² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1666683317029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833341658564 + 833341658565.

It is an arithmetic number, because the mean of its divisors is an integer number (833341658565).

Almost surely, 2^{1666683317129} is an apocalyptic number.

It is an amenable number.

1666683317129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666683317129 is an equidigital number, since it uses as much as digits as its factorization.

1666683317129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11757312, while the sum is 59.

The spelling of 1666683317129 in words is "one trillion, six hundred sixty-six billion, six hundred eighty-three million, three hundred seventeen thousand, one hundred twenty-nine".