656720665012 has 12 divisors (see below), whose sum is σ = 1149273120996. Its totient is φ = 328356916160.

The previous prime is 656720664997. The next prime is 656720665021. The reversal of 656720665012 is 210566027656.

656720665012 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 2 ways, for example, as 205386614416 + 451334050596 = 453196^2 + 671814^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 394039 + ... + 1211902.

It is an arithmetic number, because the mean of its divisors is an integer number (95772760083).

Almost surely, 2^656720665012 is an apocalyptic number.

It is an amenable number.

656720665012 is a deficient number, since it is larger than the sum of its proper divisors (492552455984).

656720665012 is a wasteful number, since it uses less digits than its factorization.

656720665012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1708178 (or 1708176 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 46.

The spelling of 656720665012 in words is "six hundred fifty-six billion, seven hundred twenty million, six hundred sixty-five thousand, twelve".