656471879712 has 144 divisors (see below), whose sum is σ = 2038540271040. Its totient is φ = 198736934400.

The previous prime is 656471879669. The next prime is 656471879731. The reversal of 656471879712 is 217978174656.

656471879712 is a `hidden beast` number, since 65 + 6 + 471 + 8 + 7 + 97 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a self number, because there is not a number n which added to its sum of digits gives 656471879712.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3165714 + ... + 3366702.

It is an arithmetic number, because the mean of its divisors is an integer number (14156529660).

Almost surely, 2^656471879712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656471879712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1019270135520).

656471879712 is an abundant number, since it is smaller than the sum of its proper divisors (1382068391328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

656471879712 is a wasteful number, since it uses less digits than its factorization.

656471879712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202047 (or 202036 counting only the distinct ones).

The product of its digits is 35562240, while the sum is 63.

The spelling of 656471879712 in words is "six hundred fifty-six billion, four hundred seventy-one million, eight hundred seventy-nine thousand, seven hundred twelve".