660653659 has 4 divisors (see below), whose sum is σ = 660739104. Its totient is φ = 660568216.

The previous prime is 660653629. The next prime is 660653663. The reversal of 660653659 is 956356066.

660653659 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 is a cyclic number.

It is not a de Polignac number, because 660653659 - 2⁵ = 660653627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660653629) 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, 29827 + ... + 47020.

It is an arithmetic number, because the mean of its divisors is an integer number (165184776).

Almost surely, 2^660653659 is an apocalyptic number.

660653659 is a deficient number, since it is larger than the sum of its proper divisors (85445).

660653659 is an equidigital number, since it uses as much as digits as its factorization.

660653659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85444.

The product of its (nonzero) digits is 874800, while the sum is 46.

The square root of 660653659 is about 25703.1838300239. The cubic root of 660653659 is about 870.9461055626.

The spelling of 660653659 in words is "six hundred sixty million, six hundred fifty-three thousand, six hundred fifty-nine".