664646611 has 4 divisors (see below), whose sum is σ = 665201224. Its totient is φ = 664092000.

The previous prime is 664646597. The next prime is 664646627. The reversal of 664646611 is 116646466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 664646611 - 2⁵ = 664646579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664646641) 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 3 ways as a sum of consecutive naturals, for example, 275505 + ... + 277906.

It is an arithmetic number, because the mean of its divisors is an integer number (166300306).

Almost surely, 2^664646611 is an apocalyptic number.

664646611 is a deficient number, since it is larger than the sum of its proper divisors (554613).

664646611 is a wasteful number, since it uses less digits than its factorization.

664646611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554612.

The product of its digits is 124416, while the sum is 40.

The square root of 664646611 is about 25780.7410870983. The cubic root of 664646611 is about 872.6972314605.

The spelling of 664646611 in words is "six hundred sixty-four million, six hundred forty-six thousand, six hundred eleven".