1668334999 has 2 divisors, whose sum is σ = 1668335000. Its totient is φ = 1668334998.

The previous prime is 1668334979. The next prime is 1668335023. The reversal of 1668334999 is 9994338661.

It is a weak prime.

It is an emirp because it is prime and its reverse (9994338661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1668334999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1668334949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834167499 + 834167500.

It is an arithmetic number, because the mean of its divisors is an integer number (834167500).

Almost surely, 2^1668334999 is an apocalyptic number.

1668334999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668334999 is an equidigital number, since it uses as much as digits as its factorization.

1668334999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7558272, while the sum is 58.

The square root of 1668334999 is about 40845.2567503254. The cubic root of 1668334999 is about 1186.0265749102.

The spelling of 1668334999 in words is "one billion, six hundred sixty-eight million, three hundred thirty-four thousand, nine hundred ninety-nine".