664252229 has 2 divisors, whose sum is σ = 664252230. Its totient is φ = 664252228.

The previous prime is 664252219. The next prime is 664252297. The reversal of 664252229 is 922252466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 475327204 + 188925025 = 21802^2 + 13745^2 .

It is a cyclic number.

It is not a de Polignac number, because 664252229 - 2²⁴ = 647475013 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 664252192 and 664252201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664252219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332126114 + 332126115.

It is an arithmetic number, because the mean of its divisors is an integer number (332126115).

Almost surely, 2^664252229 is an apocalyptic number.

It is an amenable number.

664252229 is a deficient number, since it is larger than the sum of its proper divisors (1).

664252229 is an equidigital number, since it uses as much as digits as its factorization.

664252229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 38.

The square root of 664252229 is about 25773.0911805317. The cubic root of 664252229 is about 872.5245862427.

The spelling of 664252229 in words is "six hundred sixty-four million, two hundred fifty-two thousand, two hundred twenty-nine".