1668146999 has 2 divisors, whose sum is σ = 1668147000. Its totient is φ = 1668146998.

The previous prime is 1668146969. The next prime is 1668147001. The reversal of 1668146999 is 9996418661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1668146999 - 2²⁰ = 1667098423 is a prime.

Together with 1668147001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1668146939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834073499 + 834073500.

It is an arithmetic number, because the mean of its divisors is an integer number (834073500).

Almost surely, 2^1668146999 is an apocalyptic number.

1668146999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668146999 is an equidigital number, since it uses as much as digits as its factorization.

1668146999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5038848, while the sum is 59.

The square root of 1668146999 is about 40842.9553166761. The cubic root of 1668146999 is about 1185.9820232320.

The spelling of 1668146999 in words is "one billion, six hundred sixty-eight million, one hundred forty-six thousand, nine hundred ninety-nine".