664824863 has 4 divisors (see below), whose sum is σ = 666280080. Its totient is φ = 663369648.

The previous prime is 664824857. The next prime is 664824883. The reversal of 664824863 is 368428466.

664824863 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 664824863 - 2⁴ = 664824847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664824883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 726923 + ... + 727836.

It is an arithmetic number, because the mean of its divisors is an integer number (166570020).

Almost surely, 2^664824863 is an apocalyptic number.

664824863 is a deficient number, since it is larger than the sum of its proper divisors (1455217).

664824863 is a wasteful number, since it uses less digits than its factorization.

664824863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1455216.

The product of its digits is 1327104, while the sum is 47.

The square root of 664824863 is about 25784.1979320668. The cubic root of 664824863 is about 872.7752408968.

The spelling of 664824863 in words is "six hundred sixty-four million, eight hundred twenty-four thousand, eight hundred sixty-three".