668283061669 has 2 divisors, whose sum is σ = 668283061670. Its totient is φ = 668283061668.

The previous prime is 668283061643. The next prime is 668283061759. The reversal of 668283061669 is 966160382866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 402099296769 + 266183764900 = 634113^2 + 515930^2 .

It is a cyclic number.

It is not a de Polignac number, because 668283061669 - 2⁵ = 668283061637 is a prime.

It is a super-3 number, since 3×668283061669³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668283061169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334141530834 + 334141530835.

It is an arithmetic number, because the mean of its divisors is an integer number (334141530835).

Almost surely, 2^668283061669 is an apocalyptic number.

It is an amenable number.

668283061669 is a deficient number, since it is larger than the sum of its proper divisors (1).

668283061669 is an equidigital number, since it uses as much as digits as its factorization.

668283061669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26873856, while the sum is 61.

The spelling of 668283061669 in words is "six hundred sixty-eight billion, two hundred eighty-three million, sixty-one thousand, six hundred sixty-nine".