668820885269 has 2 divisors, whose sum is σ = 668820885270. Its totient is φ = 668820885268.

The previous prime is 668820885251. The next prime is 668820885287. The reversal of 668820885269 is 962588028866.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (668820885251) and next prime (668820885287).

It can be written as a sum of positive squares in only one way, i.e., 550026923044 + 118793962225 = 741638^2 + 344665^2 .

It is a cyclic number.

It is not a de Polignac number, because 668820885269 - 2⁸ = 668820885013 is a prime.

It is a super-2 number, since 2×668820885269² (a number of 24 digits) contains 22 as substring.

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 = 668820885199 and 668820885208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668820885169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334410442634 + 334410442635.

It is an arithmetic number, because the mean of its divisors is an integer number (334410442635).

Almost surely, 2^668820885269 is an apocalyptic number.

It is an amenable number.

668820885269 is a deficient number, since it is larger than the sum of its proper divisors (1).

668820885269 is an equidigital number, since it uses as much as digits as its factorization.

668820885269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 159252480, while the sum is 68.

The spelling of 668820885269 in words is "six hundred sixty-eight billion, eight hundred twenty million, eight hundred eighty-five thousand, two hundred sixty-nine".