1668334655399 has 2 divisors, whose sum is σ = 1668334655400. Its totient is φ = 1668334655398.

The previous prime is 1668334655381. The next prime is 1668334655401. The reversal of 1668334655399 is 9935564338661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1668334655399 is a prime.

Together with 1668334655401, 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 (1668334655359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834167327699 + 834167327700.

It is an arithmetic number, because the mean of its divisors is an integer number (834167327700).

Almost surely, 2^{1668334655399} is an apocalyptic number.

1668334655399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668334655399 is an equidigital number, since it uses as much as digits as its factorization.

1668334655399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 377913600, while the sum is 68.

The spelling of 1668334655399 in words is "one trillion, six hundred sixty-eight billion, three hundred thirty-four million, six hundred fifty-five thousand, three hundred ninety-nine".