1668678353 has 2 divisors, whose sum is σ = 1668678354. Its totient is φ = 1668678352.

The previous prime is 1668678337. The next prime is 1668678373. The reversal of 1668678353 is 3538768661.

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., 1662763729 + 5914624 = 40777^2 + 2432^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668678353 - 2⁴ = 1668678337 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1668678295 and 1668678304.

It is not a weakly prime, because it can be changed into another prime (1668678373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834339176 + 834339177.

It is an arithmetic number, because the mean of its divisors is an integer number (834339177).

Almost surely, 2^1668678353 is an apocalyptic number.

It is an amenable number.

1668678353 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668678353 is an equidigital number, since it uses as much as digits as its factorization.

1668678353 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 53.

The square root of 1668678353 is about 40849.4596414689. The cubic root of 1668678353 is about 1186.1079332776.

The spelling of 1668678353 in words is "one billion, six hundred sixty-eight million, six hundred seventy-eight thousand, three hundred fifty-three".