664203601 has 2 divisors, whose sum is σ = 664203602. Its totient is φ = 664203600.

The previous prime is 664203587. The next prime is 664203611. The reversal of 664203601 is 106302466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 648211600 + 15992001 = 25460^2 + 3999^2 .

It is a cyclic number.

It is not a de Polignac number, because 664203601 - 2¹⁵ = 664170833 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664203601.

It is not a weakly prime, because it can be changed into another prime (664203611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332101800 + 332101801.

It is an arithmetic number, because the mean of its divisors is an integer number (332101801).

Almost surely, 2^664203601 is an apocalyptic number.

It is an amenable number.

664203601 is a deficient number, since it is larger than the sum of its proper divisors (1).

664203601 is an equidigital number, since it uses as much as digits as its factorization.

664203601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 664203601 is about 25772.1477762332. The cubic root of 664203601 is about 872.5032940492.

The spelling of 664203601 in words is "six hundred sixty-four million, two hundred three thousand, six hundred one".