669372490169 has 2 divisors, whose sum is σ = 669372490170. Its totient is φ = 669372490168.

The previous prime is 669372490153. The next prime is 669372490253. The reversal of 669372490169 is 961094273966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 659363488144 + 10009002025 = 812012^2 + 100045^2 .

It is a cyclic number.

It is not a de Polignac number, because 669372490169 - 2⁴ = 669372490153 is a prime.

It is a super-2 number, since 2×669372490169² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (669372490139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334686245084 + 334686245085.

It is an arithmetic number, because the mean of its divisors is an integer number (334686245085).

Almost surely, 2^669372490169 is an apocalyptic number.

It is an amenable number.

669372490169 is a deficient number, since it is larger than the sum of its proper divisors (1).

669372490169 is an equidigital number, since it uses as much as digits as its factorization.

669372490169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26453952, while the sum is 62.

The spelling of 669372490169 in words is "six hundred sixty-nine billion, three hundred seventy-two million, four hundred ninety thousand, one hundred sixty-nine".