664067 has 2 divisors, whose sum is σ = 664068. Its totient is φ = 664066.

The previous prime is 664061. The next prime is 664091. The reversal of 664067 is 760466.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664067 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664067.

It is not a weakly prime, because it can be changed into another prime (664061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332033 + 332034.

It is an arithmetic number, because the mean of its divisors is an integer number (332034).

2⁶⁶⁴⁰⁶⁷ is an apocalyptic number.

664067 is a deficient number, since it is larger than the sum of its proper divisors (1).

664067 is an equidigital number, since it uses as much as digits as its factorization.

664067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 664067 is about 814.9030617196. The cubic root of 664067 is about 87.2443476551.

The spelling of 664067 in words is "six hundred sixty-four thousand, sixty-seven".