664656073 has 8 divisors (see below), whose sum is σ = 674593920. Its totient is φ = 654787440.

The previous prime is 664656067. The next prime is 664656077. The reversal of 664656073 is 370656466.

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 664656073 - 2⁹ = 664655561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664656077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2208 + ... + 36526.

It is an arithmetic number, because the mean of its divisors is an integer number (84324240).

Almost surely, 2^664656073 is an apocalyptic number.

It is an amenable number.

664656073 is a deficient number, since it is larger than the sum of its proper divisors (9937847).

664656073 is a wasteful number, since it uses less digits than its factorization.

664656073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34607.

The product of its (nonzero) digits is 544320, while the sum is 43.

The square root of 664656073 is about 25780.9245955222. The cubic root of 664656073 is about 872.7013727198.

The spelling of 664656073 in words is "six hundred sixty-four million, six hundred fifty-six thousand, seventy-three".