664544507 has 8 divisors (see below), whose sum is σ = 729760512. Its totient is φ = 600129000.

The previous prime is 664544473. The next prime is 664544509. The reversal of 664544507 is 705445466.

It is a happy number.

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 664544507 - 2¹⁰ = 664543483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664544509) 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, 198383 + ... + 201704.

It is an arithmetic number, because the mean of its divisors is an integer number (91220064).

Almost surely, 2^664544507 is an apocalyptic number.

664544507 is a deficient number, since it is larger than the sum of its proper divisors (65216005).

664544507 is a wasteful number, since it uses less digits than its factorization.

664544507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400249.

The product of its (nonzero) digits is 403200, while the sum is 41.

The square root of 664544507 is about 25778.7607731636. The cubic root of 664544507 is about 872.6525408234.

The spelling of 664544507 in words is "six hundred sixty-four million, five hundred forty-four thousand, five hundred seven".