664847999 has 2 divisors, whose sum is σ = 664848000. Its totient is φ = 664847998.

The previous prime is 664847969. The next prime is 664848029. The reversal of 664847999 is 999748466.

It is a balanced prime because it is at equal distance from previous prime (664847969) and next prime (664848029).

It is a cyclic number.

It is not a de Polignac number, because 664847999 - 2¹² = 664843903 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664847929) 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, 332423999 + 332424000.

It is an arithmetic number, because the mean of its divisors is an integer number (332424000).

Almost surely, 2^664847999 is an apocalyptic number.

664847999 is a deficient number, since it is larger than the sum of its proper divisors (1).

664847999 is an equidigital number, since it uses as much as digits as its factorization.

664847999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23514624, while the sum is 62.

The square root of 664847999 is about 25784.6465750454. The cubic root of 664847999 is about 872.7853650136.

The spelling of 664847999 in words is "six hundred sixty-four million, eight hundred forty-seven thousand, nine hundred ninety-nine".