664425529 has 2 divisors, whose sum is σ = 664425530. Its totient is φ = 664425528.

The previous prime is 664425469. The next prime is 664425557. The reversal of 664425529 is 925524466.

664425529 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 651270400 + 13155129 = 25520^2 + 3627^2 .

It is a cyclic number.

It is not a de Polignac number, because 664425529 - 2⁷ = 664425401 is a prime.

It is a super-2 number, since 2×664425529² = 882922567173859682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (664425589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332212764 + 332212765.

It is an arithmetic number, because the mean of its divisors is an integer number (332212765).

Almost surely, 2^664425529 is an apocalyptic number.

It is an amenable number.

664425529 is a deficient number, since it is larger than the sum of its proper divisors (1).

664425529 is an equidigital number, since it uses as much as digits as its factorization.

664425529 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 43.

The square root of 664425529 is about 25776.4529949332. The cubic root of 664425529 is about 872.6004587081.

The spelling of 664425529 in words is "six hundred sixty-four million, four hundred twenty-five thousand, five hundred twenty-nine".