656736868637656 has 32 divisors (see below), whose sum is σ = 1258408818216000. Its totient is φ = 321237450982656.

The previous prime is 656736868637653. The next prime is 656736868637687.

656736868637656 is nontrivially palindromic in base 10.

656736868637656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656736868637653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4766631181 + ... + 4766768956.

It is an arithmetic number, because the mean of its divisors is an integer number (39325275569250).

Almost surely, 2^{656736868637656} is an apocalyptic number.

It is an amenable number.

656736868637656 is a deficient number, since it is larger than the sum of its proper divisors (601671949578344).

656736868637656 is a wasteful number, since it uses less digits than its factorization.

656736868637656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9533400331 (or 9533400327 counting only the distinct ones).

The product of its digits is 197522841600, while the sum is 88.

The spelling of 656736868637656 in words is "six hundred fifty-six trillion, seven hundred thirty-six billion, eight hundred sixty-eight million, six hundred thirty-seven thousand, six hundred fifty-six".