664303643 has 8 divisors (see below), whose sum is σ = 677334528. Its totient is φ = 651291264.

The previous prime is 664303613. The next prime is 664303691. The reversal of 664303643 is 346303466.

It is a happy number.

664303643 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 664303643 - 2²⁰ = 663255067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664303613) 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, 84371 + ... + 91907.

It is an arithmetic number, because the mean of its divisors is an integer number (84666816).

Almost surely, 2^664303643 is an apocalyptic number.

664303643 is a deficient number, since it is larger than the sum of its proper divisors (13030885).

664303643 is a wasteful number, since it uses less digits than its factorization.

664303643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9253.

The product of its (nonzero) digits is 93312, while the sum is 35.

The square root of 664303643 is about 25774.0885968835. The cubic root of 664303643 is about 872.5470971804.

The spelling of 664303643 in words is "six hundred sixty-four million, three hundred three thousand, six hundred forty-three".