669911611 has 2 divisors, whose sum is σ = 669911612. Its totient is φ = 669911610.

The previous prime is 669911597. The next prime is 669911647. The reversal of 669911611 is 116119966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 669911611 - 2⁵ = 669911579 is a prime.

It is not a weakly prime, because it can be changed into another prime (669911111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334955805 + 334955806.

It is an arithmetic number, because the mean of its divisors is an integer number (334955806).

Almost surely, 2^669911611 is an apocalyptic number.

669911611 is a deficient number, since it is larger than the sum of its proper divisors (1).

669911611 is an equidigital number, since it uses as much as digits as its factorization.

669911611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 40.

The square root of 669911611 is about 25882.6507722837. The cubic root of 669911611 is about 874.9955312969.

The spelling of 669911611 in words is "six hundred sixty-nine million, nine hundred eleven thousand, six hundred eleven".