668633245853 has 2 divisors, whose sum is σ = 668633245854. Its totient is φ = 668633245852.

The previous prime is 668633245829. The next prime is 668633245883. The reversal of 668633245853 is 358542336866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 381870853849 + 286762392004 = 617957^2 + 535502^2 .

It is a cyclic number.

It is not a de Polignac number, because 668633245853 - 2²² = 668629051549 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 668633245792 and 668633245801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668633245883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334316622926 + 334316622927.

It is an arithmetic number, because the mean of its divisors is an integer number (334316622927).

Almost surely, 2^668633245853 is an apocalyptic number.

It is an amenable number.

668633245853 is a deficient number, since it is larger than the sum of its proper divisors (1).

668633245853 is an equidigital number, since it uses as much as digits as its factorization.

668633245853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 74649600, while the sum is 59.

The spelling of 668633245853 in words is "six hundred sixty-eight billion, six hundred thirty-three million, two hundred forty-five thousand, eight hundred fifty-three".