669226013 has 2 divisors, whose sum is σ = 669226014. Its totient is φ = 669226012.

The previous prime is 669226007. The next prime is 669226027. The reversal of 669226013 is 310622966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 380328004 + 288898009 = 19502^2 + 16997^2 .

It is a cyclic number.

It is not a de Polignac number, because 669226013 - 2¹⁰ = 669224989 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669226073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334613006 + 334613007.

It is an arithmetic number, because the mean of its divisors is an integer number (334613007).

Almost surely, 2^669226013 is an apocalyptic number.

It is an amenable number.

669226013 is a deficient number, since it is larger than the sum of its proper divisors (1).

669226013 is an equidigital number, since it uses as much as digits as its factorization.

669226013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 669226013 is about 25869.4030275150. The cubic root of 669226013 is about 874.6969347158.

Adding to 669226013 its reverse (310622966), we get a palindrome (979848979).

The spelling of 669226013 in words is "six hundred sixty-nine million, two hundred twenty-six thousand, thirteen".