656666444666656 has 48 divisors (see below), whose sum is σ = 1368872345524320. Its totient is φ = 309016678302720.

The previous prime is 656666444666633. The next prime is 656666444666677.

656666444666656 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×656666444666656² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 656666444666656.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54644635 + ... + 65569573.

It is an arithmetic number, because the mean of its divisors is an integer number (28518173865090).

Almost surely, 2^{656666444666656} is an apocalyptic number.

It is an amenable number.

656666444666656 is an abundant number, since it is smaller than the sum of its proper divisors (712205900857664).

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

656666444666656 is a wasteful number, since it uses less digits than its factorization.

656666444666656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11035457 (or 11035449 counting only the distinct ones).

The product of its digits is 96745881600, while the sum is 82.

The spelling of 656666444666656 in words is "six hundred fifty-six trillion, six hundred sixty-six billion, four hundred forty-four million, six hundred sixty-six thousand, six hundred fifty-six".