664435379 has 2 divisors, whose sum is σ = 664435380. Its totient is φ = 664435378.

The previous prime is 664435357. The next prime is 664435399. The reversal of 664435379 is 973534466.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664435379 is a prime.

It is not a weakly prime, because it can be changed into another prime (664435319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332217689 + 332217690.

It is an arithmetic number, because the mean of its divisors is an integer number (332217690).

Almost surely, 2^664435379 is an apocalyptic number.

664435379 is a deficient number, since it is larger than the sum of its proper divisors (1).

664435379 is an equidigital number, since it uses as much as digits as its factorization.

664435379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 47.

The square root of 664435379 is about 25776.6440600789. The cubic root of 664435379 is about 872.6047707399.

The spelling of 664435379 in words is "six hundred sixty-four million, four hundred thirty-five thousand, three hundred seventy-nine".