656820183808 has 72 divisors (see below), whose sum is σ = 1370089340928. Its totient is φ = 313669542912.

The previous prime is 656820183787. The next prime is 656820183809. The reversal of 656820183808 is 808381028656.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (656820183809) 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, 3939841 + ... + 4103167.

It is an arithmetic number, because the mean of its divisors is an integer number (19029018624).

Almost surely, 2^656820183808 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 656820183808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (685044670464).

656820183808 is an abundant number, since it is smaller than the sum of its proper divisors (713269157120).

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

656820183808 is a wasteful number, since it uses less digits than its factorization.

656820183808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164049 (or 164035 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 55.

The spelling of 656820183808 in words is "six hundred fifty-six billion, eight hundred twenty million, one hundred eighty-three thousand, eight hundred eight".