664045601 has 2 divisors, whose sum is σ = 664045602. Its totient is φ = 664045600.

The previous prime is 664045583. The next prime is 664045631. The reversal of 664045601 is 106540466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 374229025 + 289816576 = 19345^2 + 17024^2 .

It is a cyclic number.

It is not a de Polignac number, because 664045601 - 2¹⁴ = 664029217 is a prime.

It is not a weakly prime, because it can be changed into another prime (664045631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332022800 + 332022801.

It is an arithmetic number, because the mean of its divisors is an integer number (332022801).

Almost surely, 2^664045601 is an apocalyptic number.

It is an amenable number.

664045601 is a deficient number, since it is larger than the sum of its proper divisors (1).

664045601 is an equidigital number, since it uses as much as digits as its factorization.

664045601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 664045601 is about 25769.0822692621. The cubic root of 664045601 is about 872.4341051977.

The spelling of 664045601 in words is "six hundred sixty-four million, forty-five thousand, six hundred one".