664389347 has 2 divisors, whose sum is σ = 664389348. Its totient is φ = 664389346.

The previous prime is 664389331. The next prime is 664389409. The reversal of 664389347 is 743983466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664389347 - 2⁴ = 664389331 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 664389295 and 664389304.

It is not a weakly prime, because it can be changed into another prime (664389307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332194673 + 332194674.

It is an arithmetic number, because the mean of its divisors is an integer number (332194674).

Almost surely, 2^664389347 is an apocalyptic number.

664389347 is a deficient number, since it is larger than the sum of its proper divisors (1).

664389347 is an equidigital number, since it uses as much as digits as its factorization.

664389347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 50.

The square root of 664389347 is about 25775.7511432742. The cubic root of 664389347 is about 872.5846189581.

The spelling of 664389347 in words is "six hundred sixty-four million, three hundred eighty-nine thousand, three hundred forty-seven".