656222656 has 56 divisors (see below), whose sum is σ = 1352743040. Its totient is φ = 315608832.

The previous prime is 656222647. The next prime is 656222719.

656222656 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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182605 + ... + 186163.

Almost surely, 2^656222656 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 656222656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (676371520).

656222656 is an abundant number, since it is smaller than the sum of its proper divisors (696520384).

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

656222656 is a wasteful number, since it uses less digits than its factorization.

656222656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3681 (or 3671 counting only the distinct ones).

The product of its digits is 259200, while the sum is 40.

The square root of 656222656 is about 25616.8432091076. The cubic root of 656222656 is about 868.9945914067.

The spelling of 656222656 in words is "six hundred fifty-six million, two hundred twenty-two thousand, six hundred fifty-six".