660221041 has 4 divisors (see below), whose sum is σ = 661789684. Its totient is φ = 658652400.

The previous prime is 660221017. The next prime is 660221071. The reversal of 660221041 is 140122066.

660221041 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 810000 + 659411041 = 900^2 + 25679^2 .

It is a cyclic number.

It is not a de Polignac number, because 660221041 - 2¹³ = 660212849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660221071) 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, 783690 + ... + 784531.

It is an arithmetic number, because the mean of its divisors is an integer number (165447421).

Almost surely, 2^660221041 is an apocalyptic number.

It is an amenable number.

660221041 is a deficient number, since it is larger than the sum of its proper divisors (1568643).

660221041 is a wasteful number, since it uses less digits than its factorization.

660221041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1568642.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 660221041 is about 25694.7668018217. The cubic root of 660221041 is about 870.7559558872.

The spelling of 660221041 in words is "six hundred sixty million, two hundred twenty-one thousand, forty-one".