664321611 has 8 divisors (see below), whose sum is σ = 886911120. Its totient is φ = 442306592.

The previous prime is 664321607. The next prime is 664321639. The reversal of 664321611 is 116123466.

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 664321611 - 2² = 664321607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664321601) 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, 140916 + ... + 145553.

It is an arithmetic number, because the mean of its divisors is an integer number (110863890).

Almost surely, 2^664321611 is an apocalyptic number.

664321611 is a deficient number, since it is larger than the sum of its proper divisors (222589509).

664321611 is a wasteful number, since it uses less digits than its factorization.

664321611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287245.

The product of its digits is 5184, while the sum is 30.

The square root of 664321611 is about 25774.4371616530. The cubic root of 664321611 is about 872.5549639570.

The spelling of 664321611 in words is "six hundred sixty-four million, three hundred twenty-one thousand, six hundred eleven".