660441589 has 4 divisors (see below), whose sum is σ = 660588300. Its totient is φ = 660294880.

The previous prime is 660441559. The next prime is 660441599. The reversal of 660441589 is 985144066.

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

It can be written as a sum of positive squares in 2 ways, for example, as 592922500 + 67519089 = 24350^2 + 8217^2 .

It is a cyclic number.

It is not a de Polignac number, because 660441589 - 2²³ = 652052981 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 (660441559) 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, 66382 + ... + 75679.

It is an arithmetic number, because the mean of its divisors is an integer number (165147075).

Almost surely, 2^660441589 is an apocalyptic number.

It is an amenable number.

660441589 is a deficient number, since it is larger than the sum of its proper divisors (146711).

660441589 is a wasteful number, since it uses less digits than its factorization.

660441589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146710.

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

The square root of 660441589 is about 25699.0581344920. The cubic root of 660441589 is about 870.8529042790.

The spelling of 660441589 in words is "six hundred sixty million, four hundred forty-one thousand, five hundred eighty-nine".