1668684676049 has 2 divisors, whose sum is σ = 1668684676050. Its totient is φ = 1668684676048.

The previous prime is 1668684676003. The next prime is 1668684676147. The reversal of 1668684676049 is 9406764868661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1570547836225 + 98136839824 = 1253215^2 + 313268^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668684676049 - 2⁸ = 1668684675793 is a prime.

It is not a weakly prime, because it can be changed into another prime (1668684676349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834342338024 + 834342338025.

It is an arithmetic number, because the mean of its divisors is an integer number (834342338025).

Almost surely, 2^{1668684676049} is an apocalyptic number.

It is an amenable number.

1668684676049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668684676049 is an equidigital number, since it uses as much as digits as its factorization.

1668684676049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 501645312, while the sum is 71.

The spelling of 1668684676049 in words is "one trillion, six hundred sixty-eight billion, six hundred eighty-four million, six hundred seventy-six thousand, forty-nine".