656811099648 has 480 divisors, whose sum is σ = 2194587787392. Its totient is φ = 194387558400.

The previous prime is 656811099619. The next prime is 656811099653. The reversal of 656811099648 is 846990118656.

656811099648 is a `hidden beast` number, since 6 + 568 + 1 + 1 + 0 + 9 + 9 + 64 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58843188 + ... + 58854348.

Almost surely, 2^656811099648 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 656811099648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1097293893696).

656811099648 is an abundant number, since it is smaller than the sum of its proper divisors (1537776687744).

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

656811099648 is a wasteful number, since it uses less digits than its factorization.

656811099648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11248 (or 11220 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 63.

The spelling of 656811099648 in words is "six hundred fifty-six billion, eight hundred eleven million, ninety-nine thousand, six hundred forty-eight".