664211629 has 2 divisors, whose sum is σ = 664211630. Its totient is φ = 664211628.

The previous prime is 664211609. The next prime is 664211663. The reversal of 664211629 is 926112466.

664211629 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 586947529 + 77264100 = 24227^2 + 8790^2 .

It is a cyclic number.

It is not a de Polignac number, because 664211629 - 2¹⁵ = 664178861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664211609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332105814 + 332105815.

It is an arithmetic number, because the mean of its divisors is an integer number (332105815).

Almost surely, 2^664211629 is an apocalyptic number.

It is an amenable number.

664211629 is a deficient number, since it is larger than the sum of its proper divisors (1).

664211629 is an equidigital number, since it uses as much as digits as its factorization.

664211629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The square root of 664211629 is about 25772.3035252963. The cubic root of 664211629 is about 872.5068092506.

The spelling of 664211629 in words is "six hundred sixty-four million, two hundred eleven thousand, six hundred twenty-nine".