664511 has 2 divisors, whose sum is σ = 664512. Its totient is φ = 664510.

The previous prime is 664507. The next prime is 664529. The reversal of 664511 is 115466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664511 - 2² = 664507 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332255 + 332256.

It is an arithmetic number, because the mean of its divisors is an integer number (332256).

2⁶⁶⁴⁵¹¹ is an apocalyptic number.

664511 is a deficient number, since it is larger than the sum of its proper divisors (1).

664511 is an equidigital number, since it uses as much as digits as its factorization.

664511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 23.

The square root of 664511 is about 815.1754412395. The cubic root of 664511 is about 87.2637873905.

Adding to 664511 its reverse (115466), we get a palindrome (779977).

The spelling of 664511 in words is "six hundred sixty-four thousand, five hundred eleven".