664433791 has 8 divisors (see below), whose sum is σ = 760110624. Its totient is φ = 568946400.

The previous prime is 664433771. The next prime is 664433837. The reversal of 664433791 is 197334466.

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 664433791 - 2¹³ = 664425599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664433711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39760 + ... + 53941.

It is an arithmetic number, because the mean of its divisors is an integer number (95013828).

Almost surely, 2^664433791 is an apocalyptic number.

664433791 is a deficient number, since it is larger than the sum of its proper divisors (95676833).

664433791 is a wasteful number, since it uses less digits than its factorization.

664433791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94721.

The product of its digits is 326592, while the sum is 43.

The square root of 664433791 is about 25776.6132569816. The cubic root of 664433791 is about 872.6040755645.

The spelling of 664433791 in words is "six hundred sixty-four million, four hundred thirty-three thousand, seven hundred ninety-one".