664203679 has 2 divisors, whose sum is σ = 664203680. Its totient is φ = 664203678.

The previous prime is 664203643. The next prime is 664203689. The reversal of 664203679 is 976302466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664203679 - 2¹³ = 664195487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664203689) 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, 332101839 + 332101840.

It is an arithmetic number, because the mean of its divisors is an integer number (332101840).

Almost surely, 2^664203679 is an apocalyptic number.

664203679 is a deficient number, since it is larger than the sum of its proper divisors (1).

664203679 is an equidigital number, since it uses as much as digits as its factorization.

664203679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 43.

The square root of 664203679 is about 25772.1492894947. The cubic root of 664203679 is about 872.5033282030.

The spelling of 664203679 in words is "six hundred sixty-four million, two hundred three thousand, six hundred seventy-nine".