669120516269 has 2 divisors, whose sum is σ = 669120516270. Its totient is φ = 669120516268.

The previous prime is 669120516217. The next prime is 669120516271. The reversal of 669120516269 is 962615021966.

669120516269 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 657944855044 + 11175661225 = 811138^2 + 105715^2 .

It is a cyclic number.

It is not a de Polignac number, because 669120516269 - 2¹² = 669120512173 is a prime.

It is a super-2 number, since 2×669120516269² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 669120516271, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 669120516269.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669120516209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334560258134 + 334560258135.

It is an arithmetic number, because the mean of its divisors is an integer number (334560258135).

Almost surely, 2^669120516269 is an apocalyptic number.

It is an amenable number.

669120516269 is a deficient number, since it is larger than the sum of its proper divisors (1).

669120516269 is an equidigital number, since it uses as much as digits as its factorization.

669120516269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The spelling of 669120516269 in words is "six hundred sixty-nine billion, one hundred twenty million, five hundred sixteen thousand, two hundred sixty-nine".