6656863784256 has 336 divisors, whose sum is σ = 23138255455680. Its totient is φ = 1870779939840.

The previous prime is 6656863784239. The next prime is 6656863784267. The reversal of 6656863784256 is 6524873686566.

6656863784256 is a `hidden beast` number, since 6 + 6 + 56 + 86 + 3 + 78 + 425 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (336).

It is a super-2 number, since 2×6656863784256² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4520571 + ... + 5809413.

Almost surely, 2^{6656863784256} 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 6656863784256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11569127727840).

6656863784256 is an abundant number, since it is smaller than the sum of its proper divisors (16481391671424).

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

6656863784256 is a wasteful number, since it uses less digits than its factorization.

6656863784256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288939 (or 1288916 counting only the distinct ones).

The product of its digits is 2090188800, while the sum is 72.

The spelling of 6656863784256 in words is "six trillion, six hundred fifty-six billion, eight hundred sixty-three million, seven hundred eighty-four thousand, two hundred fifty-six".