664099 has 2 divisors, whose sum is σ = 664100. Its totient is φ = 664098.

The previous prime is 664091. The next prime is 664109. The reversal of 664099 is 990466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664099 - 2³ = 664091 is a prime.

It is not a weakly prime, because it can be changed into another prime (664091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332049 + 332050.

It is an arithmetic number, because the mean of its divisors is an integer number (332050).

2⁶⁶⁴⁰⁹⁹ is an apocalyptic number.

664099 is a deficient number, since it is larger than the sum of its proper divisors (1).

664099 is an equidigital number, since it uses as much as digits as its factorization.

664099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 664099 is about 814.9226957203. The cubic root of 664099 is about 87.2457490068.

The spelling of 664099 in words is "six hundred sixty-four thousand, ninety-nine".