1668964013 has 2 divisors, whose sum is σ = 1668964014. Its totient is φ = 1668964012.

The previous prime is 1668963997. The next prime is 1668964027. The reversal of 1668964013 is 3104698661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1199721769 + 469242244 = 34637^2 + 21662^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668964013 - 2⁴ = 1668963997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1668964813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834482006 + 834482007.

It is an arithmetic number, because the mean of its divisors is an integer number (834482007).

Almost surely, 2^1668964013 is an apocalyptic number.

It is an amenable number.

1668964013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668964013 is an equidigital number, since it uses as much as digits as its factorization.

1668964013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 1668964013 is about 40852.9559885206. The cubic root of 1668964013 is about 1186.1756124400.

The spelling of 1668964013 in words is "one billion, six hundred sixty-eight million, nine hundred sixty-four thousand, thirteen".