669959442169 has 2 divisors, whose sum is σ = 669959442170. Its totient is φ = 669959442168.

The previous prime is 669959442161. The next prime is 669959442203. The reversal of 669959442169 is 961244959966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 669590341225 + 369100944 = 818285^2 + 19212^2 .

It is a cyclic number.

It is not a de Polignac number, because 669959442169 - 2³ = 669959442161 is a prime.

It is a super-2 number, since 2×669959442169² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 669959442098 and 669959442107.

It is not a weakly prime, because it can be changed into another prime (669959442161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334979721084 + 334979721085.

It is an arithmetic number, because the mean of its divisors is an integer number (334979721085).

Almost surely, 2^669959442169 is an apocalyptic number.

It is an amenable number.

669959442169 is a deficient number, since it is larger than the sum of its proper divisors (1).

669959442169 is an equidigital number, since it uses as much as digits as its factorization.

669959442169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226748160, while the sum is 70.

The spelling of 669959442169 in words is "six hundred sixty-nine billion, nine hundred fifty-nine million, four hundred forty-two thousand, one hundred sixty-nine".