6556619821696 has 256 divisors, whose sum is σ = 15489095270400. Its totient is φ = 2705346293760.

The previous prime is 6556619821613. The next prime is 6556619821709. The reversal of 6556619821696 is 6961289166556.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7134515125 + ... + 7134516043.

It is an arithmetic number, because the mean of its divisors is an integer number (60504278400).

Almost surely, 2^{6556619821696} 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 6556619821696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7744547635200).

6556619821696 is an abundant number, since it is smaller than the sum of its proper divisors (8932475448704).

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

6556619821696 is a wasteful number, since it uses less digits than its factorization.

6556619821696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2015 (or 2003 counting only the distinct ones).

The product of its digits is 251942400, while the sum is 70.

The spelling of 6556619821696 in words is "six trillion, five hundred fifty-six billion, six hundred nineteen million, eight hundred twenty-one thousand, six hundred ninety-six".