6621151680 has 896 divisors, whose sum is σ = 28757514240. Its totient is φ = 1411153920.

The previous prime is 6621151643. The next prime is 6621151727. The reversal of 6621151680 is 861511266.

6621151680 is a `hidden beast` number, since 6 + 62 + 1 + 1 + 516 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 28416844 + ... + 28417076.

It is an arithmetic number, because the mean of its divisors is an integer number (32095440).

Almost surely, 2^6621151680 is an apocalyptic number.

6621151680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6621151680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14378757120).

6621151680 is an abundant number, since it is smaller than the sum of its proper divisors (22136362560).

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

6621151680 is a wasteful number, since it uses less digits than its factorization.

6621151680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306 (or 290 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 6621151680 is about 81370.4595046630. The cubic root of 6621151680 is about 1877.7791490743.

The spelling of 6621151680 in words is "six billion, six hundred twenty-one million, one hundred fifty-one thousand, six hundred eighty".