6619855552128 has 1536 divisors, whose sum is σ = 26281728000000. Its totient is φ = 1600069386240.

The previous prime is 6619855552111. The next prime is 6619855552133. The reversal of 6619855552128 is 8212555589166.

It is a happy number.

6619855552128 is a `hidden beast` number, since 6 + 6 + 1 + 9 + 8 + 55 + 552 + 1 + 28 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 2408094498 + ... + 2408097246.

It is an arithmetic number, because the mean of its divisors is an integer number (17110500000).

Almost surely, 2^{6619855552128} 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 6619855552128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13140864000000).

6619855552128 is an abundant number, since it is smaller than the sum of its proper divisors (19661872447872).

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

6619855552128 is a wasteful number, since it uses less digits than its factorization.

6619855552128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2855 (or 2824 counting only the distinct ones).

The product of its digits is 51840000, while the sum is 63.

The spelling of 6619855552128 in words is "six trillion, six hundred nineteen billion, eight hundred fifty-five million, five hundred fifty-two thousand, one hundred twenty-eight".