664466641 has 8 divisors (see below), whose sum is σ = 706891104. Its totient is φ = 622413120.

The previous prime is 664466639. The next prime is 664466681. The reversal of 664466641 is 146664466.

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 664466641 - 2¹ = 664466639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664466611) 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, 89035 + ... + 96208.

It is an arithmetic number, because the mean of its divisors is an integer number (88361388).

Almost surely, 2^664466641 is an apocalyptic number.

It is an amenable number.

664466641 is a deficient number, since it is larger than the sum of its proper divisors (42424463).

664466641 is a wasteful number, since it uses less digits than its factorization.

664466641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185471.

The product of its digits is 497664, while the sum is 43.

The square root of 664466641 is about 25777.2504546160. The cubic root of 664466641 is about 872.6184560149.

The spelling of 664466641 in words is "six hundred sixty-four million, four hundred sixty-six thousand, six hundred forty-one".