660656072 has 8 divisors (see below), whose sum is σ = 1238730150. Its totient is φ = 330328032.

The previous prime is 660655997. The next prime is 660656081. The reversal of 660656072 is 270656066.

660656072 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 562923076 + 97732996 = 23726^2 + 9886^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41290997 + ... + 41291012.

Almost surely, 2^660656072 is an apocalyptic number.

It is an amenable number.

660656072 is a deficient number, since it is larger than the sum of its proper divisors (578074078).

660656072 is a wasteful number, since it uses less digits than its factorization.

660656072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82582015 (or 82582011 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 660656072 is about 25703.2307696912. The cubic root of 660656072 is about 870.9471659217.

The spelling of 660656072 in words is "six hundred sixty million, six hundred fifty-six thousand, seventy-two".