664075663 has 2 divisors, whose sum is σ = 664075664. Its totient is φ = 664075662.

The previous prime is 664075661. The next prime is 664075681. The reversal of 664075663 is 366570466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664075663 - 2¹ = 664075661 is a prime.

Together with 664075661, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664075661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332037831 + 332037832.

It is an arithmetic number, because the mean of its divisors is an integer number (332037832).

Almost surely, 2^664075663 is an apocalyptic number.

664075663 is a deficient number, since it is larger than the sum of its proper divisors (1).

664075663 is an equidigital number, since it uses as much as digits as its factorization.

664075663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 43.

The square root of 664075663 is about 25769.6655585594. The cubic root of 664075663 is about 872.4472703168.

The spelling of 664075663 in words is "six hundred sixty-four million, seventy-five thousand, six hundred sixty-three".