1668355441 has 2 divisors, whose sum is σ = 1668355442. Its totient is φ = 1668355440.

The previous prime is 1668355433. The next prime is 1668355453. The reversal of 1668355441 is 1445538661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1628929600 + 39425841 = 40360^2 + 6279^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668355441 - 2³ = 1668355433 is a prime.

It is not a weakly prime, because it can be changed into another prime (1668355411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834177720 + 834177721.

It is an arithmetic number, because the mean of its divisors is an integer number (834177721).

Almost surely, 2^1668355441 is an apocalyptic number.

It is an amenable number.

1668355441 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668355441 is an equidigital number, since it uses as much as digits as its factorization.

1668355441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 345600, while the sum is 43.

The square root of 1668355441 is about 40845.5069866932. The cubic root of 1668355441 is about 1186.0314189925.

The spelling of 1668355441 in words is "one billion, six hundred sixty-eight million, three hundred fifty-five thousand, four hundred forty-one".