664471 has 2 divisors, whose sum is σ = 664472. Its totient is φ = 664470.

The previous prime is 664459. The next prime is 664507. The reversal of 664471 is 174466.

664471 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664471 - 2⁹ = 663959 is a prime.

It is a super-3 number, since 3×664471³ = 880135116179277333, which contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332235 + 332236.

It is an arithmetic number, because the mean of its divisors is an integer number (332236).

2⁶⁶⁴⁴⁷¹ is an apocalyptic number.

664471 is a deficient number, since it is larger than the sum of its proper divisors (1).

664471 is an equidigital number, since it uses as much as digits as its factorization.

664471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 28.

The square root of 664471 is about 815.1509062744. The cubic root of 664471 is about 87.2620364180.

The spelling of 664471 in words is "six hundred sixty-four thousand, four hundred seventy-one".