669120516217 has 2 divisors, whose sum is σ = 669120516218. Its totient is φ = 669120516216.

The previous prime is 669120516209. The next prime is 669120516269. The reversal of 669120516217 is 712615021966.

669120516217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 597743913321 + 71376602896 = 773139^2 + 267164^2 .

It is a cyclic number.

It is not a de Polignac number, because 669120516217 - 2³ = 669120516209 is a prime.

It is not a weakly prime, because it can be changed into another prime (669120516017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334560258108 + 334560258109.

It is an arithmetic number, because the mean of its divisors is an integer number (334560258109).

Almost surely, 2^669120516217 is an apocalyptic number.

It is an amenable number.

669120516217 is a deficient number, since it is larger than the sum of its proper divisors (1).

669120516217 is an equidigital number, since it uses as much as digits as its factorization.

669120516217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 46.

The spelling of 669120516217 in words is "six hundred sixty-nine billion, one hundred twenty million, five hundred sixteen thousand, two hundred seventeen".