669120512173 has 2 divisors, whose sum is σ = 669120512174. Its totient is φ = 669120512172.

The previous prime is 669120512153. The next prime is 669120512183. The reversal of 669120512173 is 371215021966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 490506931044 + 178613581129 = 700362^2 + 422627^2 .

It is a cyclic number.

It is not a de Polignac number, because 669120512173 - 2²⁹ = 668583641261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669120512153) 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, 334560256086 + 334560256087.

It is an arithmetic number, because the mean of its divisors is an integer number (334560256087).

Almost surely, 2^669120512173 is an apocalyptic number.

It is an amenable number.

669120512173 is a deficient number, since it is larger than the sum of its proper divisors (1).

669120512173 is an equidigital number, since it uses as much as digits as its factorization.

669120512173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 43.

The spelling of 669120512173 in words is "six hundred sixty-nine billion, one hundred twenty million, five hundred twelve thousand, one hundred seventy-three".