660439641 has 8 divisors (see below), whose sum is σ = 918872640. Its totient is φ = 421149872.

The previous prime is 660439627. The next prime is 660439643. The reversal of 660439641 is 146934066.

660439641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 660439641 - 2¹⁰ = 660438617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 660439641.

It is not an unprimeable number, because it can be changed into a prime (660439643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4785726 + ... + 4785863.

It is an arithmetic number, because the mean of its divisors is an integer number (114859080).

Almost surely, 2^660439641 is an apocalyptic number.

It is an amenable number.

660439641 is a deficient number, since it is larger than the sum of its proper divisors (258432999).

660439641 is a wasteful number, since it uses less digits than its factorization.

660439641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9571615.

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 660439641 is about 25699.0202342424. The cubic root of 660439641 is about 870.8520480725.

The spelling of 660439641 in words is "six hundred sixty million, four hundred thirty-nine thousand, six hundred forty-one".