656644446656 has 56 divisors (see below), whose sum is σ = 1427433995520. Its totient is φ = 297225824000.

The previous prime is 656644446629. The next prime is 656644446677.

656644446656 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1783070 + ... + 2119581.

Almost surely, 2^656644446656 is an apocalyptic number.

It is an amenable number.

656644446656 is an abundant number, since it is smaller than the sum of its proper divisors (770789548864).

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

656644446656 is a wasteful number, since it uses less digits than its factorization.

656644446656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3902913 (or 3902903 counting only the distinct ones).

The product of its digits is 298598400, while the sum is 62.

The spelling of 656644446656 in words is "six hundred fifty-six billion, six hundred forty-four million, four hundred forty-six thousand, six hundred fifty-six".