664478833 has 8 divisors (see below), whose sum is σ = 668606400. Its totient is φ = 660359280.

The previous prime is 664478821. The next prime is 664478839. The reversal of 664478833 is 338874466.

664478833 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 664478833 - 2²⁵ = 630924401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664478839) 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, 274398 + ... + 276808.

It is an arithmetic number, because the mean of its divisors is an integer number (83575800).

Almost surely, 2^664478833 is an apocalyptic number.

It is an amenable number.

664478833 is a deficient number, since it is larger than the sum of its proper divisors (4127567).

664478833 is a wasteful number, since it uses less digits than its factorization.

664478833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4007.

The product of its digits is 2322432, while the sum is 49.

The square root of 664478833 is about 25777.4869411275. The cubic root of 664478833 is about 872.6237930770.

The spelling of 664478833 in words is "six hundred sixty-four million, four hundred seventy-eight thousand, eight hundred thirty-three".