1666829993 has 2 divisors, whose sum is σ = 1666829994. Its totient is φ = 1666829992.

The previous prime is 1666829981. The next prime is 1666830001. The reversal of 1666829993 is 3999286661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1454049424 + 212780569 = 38132^2 + 14587^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666829993 - 2¹⁴ = 1666813609 is a prime.

It is not a weakly prime, because it can be changed into another prime (1666829693) 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, 833414996 + 833414997.

It is an arithmetic number, because the mean of its divisors is an integer number (833414997).

Almost surely, 2^1666829993 is an apocalyptic number.

It is an amenable number.

1666829993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666829993 is an equidigital number, since it uses as much as digits as its factorization.

1666829993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7558272, while the sum is 59.

The square root of 1666829993 is about 40826.8293282738. The cubic root of 1666829993 is about 1185.6698291878.

The spelling of 1666829993 in words is "one billion, six hundred sixty-six million, eight hundred twenty-nine thousand, nine hundred ninety-three".