664134799 has 2 divisors, whose sum is σ = 664134800. Its totient is φ = 664134798.

The previous prime is 664134773. The next prime is 664134803. The reversal of 664134799 is 997431466.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664134799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664134199) 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, 332067399 + 332067400.

It is an arithmetic number, because the mean of its divisors is an integer number (332067400).

Almost surely, 2^664134799 is an apocalyptic number.

664134799 is a deficient number, since it is larger than the sum of its proper divisors (1).

664134799 is an equidigital number, since it uses as much as digits as its factorization.

664134799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 49.

The square root of 664134799 is about 25770.8129285826. The cubic root of 664134799 is about 872.4731667185.

The spelling of 664134799 in words is "six hundred sixty-four million, one hundred thirty-four thousand, seven hundred ninety-nine".