664379 has 2 divisors, whose sum is σ = 664380. Its totient is φ = 664378.

The previous prime is 664369. The next prime is 664381. The reversal of 664379 is 973466.

664379 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664379 - 2⁸ = 664123 is a prime.

Together with 664381, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (664319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332189 + 332190.

It is an arithmetic number, because the mean of its divisors is an integer number (332190).

2⁶⁶⁴³⁷⁹ is an apocalyptic number.

664379 is a deficient number, since it is larger than the sum of its proper divisors (1).

664379 is an equidigital number, since it uses as much as digits as its factorization.

664379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 35.

The square root of 664379 is about 815.0944730521. The cubic root of 664379 is about 87.2580089144.

The spelling of 664379 in words is "six hundred sixty-four thousand, three hundred seventy-nine".