664043611 has 16 divisors (see below), whose sum is σ = 829785600. Its totient is φ = 516257280.

The previous prime is 664043609. The next prime is 664043623. The reversal of 664043611 is 116340466.

It is not a de Polignac number, because 664043611 - 2¹ = 664043609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664043641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24970 + ... + 44176.

It is an arithmetic number, because the mean of its divisors is an integer number (51861600).

Almost surely, 2^664043611 is an apocalyptic number.

664043611 is a deficient number, since it is larger than the sum of its proper divisors (165741989).

664043611 is a wasteful number, since it uses less digits than its factorization.

664043611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19674.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 664043611 is about 25769.0436570704. The cubic root of 664043611 is about 872.4332336985.

The spelling of 664043611 in words is "six hundred sixty-four million, forty-three thousand, six hundred eleven".