1668353369029 has 2 divisors, whose sum is σ = 1668353369030. Its totient is φ = 1668353369028.

The previous prime is 1668353368961. The next prime is 1668353369087. The reversal of 1668353369029 is 9209633538661.

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., 1120750409025 + 547602960004 = 1058655^2 + 740002^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668353369029 - 2²¹ = 1668351271877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1668353369099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834176684514 + 834176684515.

It is an arithmetic number, because the mean of its divisors is an integer number (834176684515).

Almost surely, 2^{1668353369029} is an apocalyptic number.

It is an amenable number.

1668353369029 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668353369029 is an equidigital number, since it uses as much as digits as its factorization.

1668353369029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37791360, while the sum is 61.

The spelling of 1668353369029 in words is "one trillion, six hundred sixty-eight billion, three hundred fifty-three million, three hundred sixty-nine thousand, twenty-nine".