664512799 has 2 divisors, whose sum is σ = 664512800. Its totient is φ = 664512798.

The previous prime is 664512791. The next prime is 664512839. The reversal of 664512799 is 997215466.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664512799 - 2³ = 664512791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664512791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332256399 + 332256400.

It is an arithmetic number, because the mean of its divisors is an integer number (332256400).

Almost surely, 2^664512799 is an apocalyptic number.

664512799 is a deficient number, since it is larger than the sum of its proper divisors (1).

664512799 is an equidigital number, since it uses as much as digits as its factorization.

664512799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 49.

The square root of 664512799 is about 25778.1457634175. The cubic root of 664512799 is about 872.6386613884.

The spelling of 664512799 in words is "six hundred sixty-four million, five hundred twelve thousand, seven hundred ninety-nine".