664043 has 2 divisors, whose sum is σ = 664044. Its totient is φ = 664042.

The previous prime is 664019. The next prime is 664061. The reversal of 664043 is 340466.

664043 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664043 - 2⁶ = 663979 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (664243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332021 + 332022.

It is an arithmetic number, because the mean of its divisors is an integer number (332022).

2⁶⁶⁴⁰⁴³ is an apocalyptic number.

664043 is a deficient number, since it is larger than the sum of its proper divisors (1).

664043 is an equidigital number, since it uses as much as digits as its factorization.

664043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 664043 is about 814.8883359087. Note that the first 3 decimals coincide. The cubic root of 664043 is about 87.2432966117.

The spelling of 664043 in words is "six hundred sixty-four thousand, forty-three".