660456321 has 16 divisors (see below), whose sum is σ = 1059379200. Its totient is φ = 357540048.

The previous prime is 660456317. The next prime is 660456337. The reversal of 660456321 is 123654066.

660456321 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 660456321 - 2² = 660456317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (660456301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 827241 + ... + 828038.

It is an arithmetic number, because the mean of its divisors is an integer number (66211200).

Almost surely, 2^660456321 is an apocalyptic number.

It is an amenable number.

660456321 is a deficient number, since it is larger than the sum of its proper divisors (398922879).

660456321 is a wasteful number, since it uses less digits than its factorization.

660456321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1655308.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 660456321 is about 25699.3447581840. The cubic root of 660456321 is about 870.8593793959.

The spelling of 660456321 in words is "six hundred sixty million, four hundred fifty-six thousand, three hundred twenty-one".