664041589 has 4 divisors (see below), whose sum is σ = 664462656. Its totient is φ = 663620524.

The previous prime is 664041571. The next prime is 664041667. The reversal of 664041589 is 985140466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 664041589 - 2⁷ = 664041461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664041509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208159 + ... + 211324.

It is an arithmetic number, because the mean of its divisors is an integer number (166115664).

Almost surely, 2^664041589 is an apocalyptic number.

It is an amenable number.

664041589 is a deficient number, since it is larger than the sum of its proper divisors (421067).

664041589 is a wasteful number, since it uses less digits than its factorization.

664041589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421066.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 664041589 is about 25769.0044239198. The cubic root of 664041589 is about 872.4323481835.

The spelling of 664041589 in words is "six hundred sixty-four million, forty-one thousand, five hundred eighty-nine".