664560993 has 8 divisors (see below), whose sum is σ = 887140800. Its totient is φ = 442510928.

The previous prime is 664560971. The next prime is 664561063. The reversal of 664560993 is 399065466.

It is a happy number.

664560993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 664560993 - 2¹² = 664556897 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (664560493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129498 + ... + 134531.

It is an arithmetic number, because the mean of its divisors is an integer number (110892600).

Almost surely, 2^664560993 is an apocalyptic number.

It is an amenable number.

664560993 is a deficient number, since it is larger than the sum of its proper divisors (222579807).

664560993 is a wasteful number, since it uses less digits than its factorization.

664560993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264871.

The product of its (nonzero) digits is 1049760, while the sum is 48.

The square root of 664560993 is about 25779.0805305387. The cubic root of 664560993 is about 872.6597570097.

The spelling of 664560993 in words is "six hundred sixty-four million, five hundred sixty thousand, nine hundred ninety-three".