1668355841 has 2 divisors, whose sum is σ = 1668355842. Its totient is φ = 1668355840.

The previous prime is 1668355837. The next prime is 1668355901. The reversal of 1668355841 is 1485538661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1667905600 + 450241 = 40840^2 + 671^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668355841 - 2² = 1668355837 is a prime.

It is a super-2 number, since 2×1668355841² = 5566822424397634562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1668355441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834177920 + 834177921.

It is an arithmetic number, because the mean of its divisors is an integer number (834177921).

Almost surely, 2^1668355841 is an apocalyptic number.

It is an amenable number.

1668355841 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668355841 is an equidigital number, since it uses as much as digits as its factorization.

1668355841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 691200, while the sum is 47.

The square root of 1668355841 is about 40845.5118831923. The cubic root of 1668355841 is about 1186.0315137790.

The spelling of 1668355841 in words is "one billion, six hundred sixty-eight million, three hundred fifty-five thousand, eight hundred forty-one".