664463 has 4 divisors (see below), whose sum is σ = 666288. Its totient is φ = 662640.

The previous prime is 664459. The next prime is 664471. The reversal of 664463 is 364466.

664463 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 364466 = 2 ⋅182233.

It is a cyclic number.

It is not a de Polignac number, because 664463 - 2² = 664459 is a prime.

It is a super-2 number, since 2×664463² = 883022156738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158 + ... + 1163.

It is an arithmetic number, because the mean of its divisors is an integer number (166572).

2⁶⁶⁴⁴⁶³ is an apocalyptic number.

664463 is a deficient number, since it is larger than the sum of its proper divisors (1825).

664463 is a wasteful number, since it uses less digits than its factorization.

664463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1824.

The product of its digits is 10368, while the sum is 29.

The square root of 664463 is about 815.1459991928. The cubic root of 664463 is about 87.2616862150.

The spelling of 664463 in words is "six hundred sixty-four thousand, four hundred sixty-three".