6556368181820 has 48 divisors (see below), whose sum is σ = 13798033306848. Its totient is φ = 2616898986240.

The previous prime is 6556368181763. The next prime is 6556368181861. The reversal of 6556368181820 is 281818636556.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 6556368181820.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95543762 + ... + 95612358.

It is an arithmetic number, because the mean of its divisors is an integer number (287459027226).

Almost surely, 2^{6556368181820} is an apocalyptic number.

It is an amenable number.

6556368181820 is an abundant number, since it is smaller than the sum of its proper divisors (7241665125028).

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

6556368181820 is a wasteful number, since it uses less digits than its factorization.

6556368181820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78830 (or 78828 counting only the distinct ones).

The product of its (nonzero) digits is 16588800, while the sum is 59.

The spelling of 6556368181820 in words is "six trillion, five hundred fifty-six billion, three hundred sixty-eight million, one hundred eighty-one thousand, eight hundred twenty".