656743656 has 64 divisors (see below), whose sum is σ = 1730027520. Its totient is φ = 207345600.

The previous prime is 656743631. The next prime is 656743729. The reversal of 656743656 is 656347656.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51081 + ... + 62631.

It is an arithmetic number, because the mean of its divisors is an integer number (27031680).

Almost surely, 2^656743656 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 656743656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (865013760).

656743656 is an abundant number, since it is smaller than the sum of its proper divisors (1073283864).

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

656743656 is a wasteful number, since it uses less digits than its factorization.

656743656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11686 (or 11682 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 48.

The square root of 656743656 is about 25627.0102821223. The cubic root of 656743656 is about 869.2245064684.

The spelling of 656743656 in words is "six hundred fifty-six million, seven hundred forty-three thousand, six hundred fifty-six".