1668428941 has 2 divisors, whose sum is σ = 1668428942. Its totient is φ = 1668428940.

The previous prime is 1668428933. The next prime is 1668428953. The reversal of 1668428941 is 1498248661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1259540100 + 408888841 = 35490^2 + 20221^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668428941 - 2³ = 1668428933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1668428341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834214470 + 834214471.

It is an arithmetic number, because the mean of its divisors is an integer number (834214471).

Almost surely, 2^1668428941 is an apocalyptic number.

It is an amenable number.

1668428941 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668428941 is an equidigital number, since it uses as much as digits as its factorization.

1668428941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 663552, while the sum is 49.

The square root of 1668428941 is about 40846.4067085466. The cubic root of 1668428941 is about 1186.0488357506.

The spelling of 1668428941 in words is "one billion, six hundred sixty-eight million, four hundred twenty-eight thousand, nine hundred forty-one".