660109641 has 24 divisors (see below), whose sum is σ = 916817760. Its totient is φ = 422343936.

The previous prime is 660109631. The next prime is 660109693. The reversal of 660109641 is 146901066.

660109641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 660109641 - 2⁹ = 660109129 is a prime.

It is a super-2 number, since 2×660109641² = 871489476282297762, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (660109621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 326265 + ... + 328281.

It is an arithmetic number, because the mean of its divisors is an integer number (38200740).

Almost surely, 2^660109641 is an apocalyptic number.

It is an amenable number.

660109641 is a deficient number, since it is larger than the sum of its proper divisors (256708119).

660109641 is a wasteful number, since it uses less digits than its factorization.

660109641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2165 (or 2122 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 660109641 is about 25692.5989537843. The cubic root of 660109641 is about 870.7069785177.

The spelling of 660109641 in words is "six hundred sixty million, one hundred nine thousand, six hundred forty-one".