656335533656 has 128 divisors (see below), whose sum is σ = 1449963970560. Its totient is φ = 275211417600.

The previous prime is 656335533653. The next prime is 656335533727.

It is a happy number.

656335533656 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656335533653) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15748526 + ... + 15790146.

It is an arithmetic number, because the mean of its divisors is an integer number (11327843520).

Almost surely, 2^656335533656 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 656335533656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (724981985280).

656335533656 is an abundant number, since it is smaller than the sum of its proper divisors (793628436904).

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

656335533656 is a wasteful number, since it uses less digits than its factorization.

656335533656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41865 (or 41861 counting only the distinct ones).

The product of its digits is 65610000, while the sum is 56.

The spelling of 656335533656 in words is "six hundred fifty-six billion, three hundred thirty-five million, five hundred thirty-three thousand, six hundred fifty-six".