664203643 has 2 divisors, whose sum is σ = 664203644. Its totient is φ = 664203642.

The previous prime is 664203641. The next prime is 664203679. The reversal of 664203643 is 346302466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664203643 - 2¹ = 664203641 is a prime.

Together with 664203641, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 664203599 and 664203608.

It is not a weakly prime, because it can be changed into another prime (664203641) 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, 332101821 + 332101822.

It is an arithmetic number, because the mean of its divisors is an integer number (332101822).

Almost surely, 2^664203643 is an apocalyptic number.

664203643 is a deficient number, since it is larger than the sum of its proper divisors (1).

664203643 is an equidigital number, since it uses as much as digits as its factorization.

664203643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 34.

The square root of 664203643 is about 25772.1485910663. The cubic root of 664203643 is about 872.5033124397.

The spelling of 664203643 in words is "six hundred sixty-four million, two hundred three thousand, six hundred forty-three".