1668349172653 has 2 divisors, whose sum is σ = 1668349172654. Its totient is φ = 1668349172652.

The previous prime is 1668349172593. The next prime is 1668349172663. The reversal of 1668349172653 is 3562719438661.

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., 1557072221929 + 111276950724 = 1247827^2 + 333582^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668349172653 - 2²⁹ = 1667812301741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1668349172591 and 1668349172600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1668349172663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834174586326 + 834174586327.

It is an arithmetic number, because the mean of its divisors is an integer number (834174586327).

Almost surely, 2^{1668349172653} is an apocalyptic number.

It is an amenable number.

1668349172653 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668349172653 is an equidigital number, since it uses as much as digits as its factorization.

1668349172653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39191040, while the sum is 61.

The spelling of 1668349172653 in words is "one trillion, six hundred sixty-eight billion, three hundred forty-nine million, one hundred seventy-two thousand, six hundred fifty-three".