6621385588272 has 720 divisors, whose sum is σ = 23420209114848. Its totient is φ = 1730885345280.

The previous prime is 6621385588267. The next prime is 6621385588291. The reversal of 6621385588272 is 2728855831266.

6621385588272 is a `hidden beast` number, since 6 + 6 + 2 + 1 + 3 + 8 + 558 + 8 + 2 + 72 = 666.

It is a super-2 number, since 2×6621385588272² (a number of 26 digits) contains 22 as substring.

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 143 ways as a sum of consecutive naturals, for example, 6057991758 + ... + 6057992850.

Almost surely, 2^{6621385588272} 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 6621385588272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11710104557424).

6621385588272 is an abundant number, since it is smaller than the sum of its proper divisors (16798823526576).

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

6621385588272 is a wasteful number, since it uses less digits than its factorization.

6621385588272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658 (or 1642 counting only the distinct ones).

The product of its digits is 77414400, while the sum is 63.

The spelling of 6621385588272 in words is "six trillion, six hundred twenty-one billion, three hundred eighty-five million, five hundred eighty-eight thousand, two hundred seventy-two".