664667099 has 2 divisors, whose sum is σ = 664667100. Its totient is φ = 664667098.

The previous prime is 664667089. The next prime is 664667111. The reversal of 664667099 is 990766466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664667099 - 2⁴ = 664667083 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664667099.

It is not a weakly prime, because it can be changed into another prime (664667089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332333549 + 332333550.

It is an arithmetic number, because the mean of its divisors is an integer number (332333550).

Almost surely, 2^664667099 is an apocalyptic number.

664667099 is a deficient number, since it is larger than the sum of its proper divisors (1).

664667099 is an equidigital number, since it uses as much as digits as its factorization.

664667099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2939328, while the sum is 53.

The square root of 664667099 is about 25781.1384349101. The cubic root of 664667099 is about 872.7061984498.

The spelling of 664667099 in words is "six hundred sixty-four million, six hundred sixty-seven thousand, ninety-nine".