664591211 has 8 divisors (see below), whose sum is σ = 673077600. Its totient is φ = 656142400.

The previous prime is 664591201. The next prime is 664591219. The reversal of 664591211 is 112195466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664591211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664591219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27095 + ... + 45423.

It is an arithmetic number, because the mean of its divisors is an integer number (84134700).

Almost surely, 2^664591211 is an apocalyptic number.

664591211 is a deficient number, since it is larger than the sum of its proper divisors (8486389).

664591211 is a wasteful number, since it uses less digits than its factorization.

664591211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18789.

The product of its digits is 12960, while the sum is 35.

The square root of 664591211 is about 25779.6666192563. Note that the first 4 decimals coincide. The cubic root of 664591211 is about 872.6729836024.

The spelling of 664591211 in words is "six hundred sixty-four million, five hundred ninety-one thousand, two hundred eleven".