664355 has 16 divisors (see below), whose sum is σ = 855360. Its totient is φ = 494208.

The previous prime is 664331. The next prime is 664357. The reversal of 664355 is 553466.

664355 = T₅₁₃ + T₅₁₄ + ... + T₅₁₇.

It is a cyclic number.

It is not a de Polignac number, because 664355 - 2⁸ = 664099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664357) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6041 + ... + 6149.

It is an arithmetic number, because the mean of its divisors is an integer number (53460).

2⁶⁶⁴³⁵⁵ is an apocalyptic number.

664355 is a deficient number, since it is larger than the sum of its proper divisors (191005).

664355 is a wasteful number, since it uses less digits than its factorization.

664355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190.

The product of its digits is 10800, while the sum is 29.

The square root of 664355 is about 815.0797506993. The cubic root of 664355 is about 87.2569582002.

Subtracting from 664355 its reverse (553466), we obtain a square (110889 = 333²).

The spelling of 664355 in words is "six hundred sixty-four thousand, three hundred fifty-five".