8851721544 has 96 divisors (see below), whose sum is σ = 24220110720. Its totient is φ = 2920364928.

The previous prime is 8851721531. The next prime is 8851721563. The reversal of 8851721544 is 4451271588.

8851721544 is a `hidden beast` number, since 8 + 85 + 1 + 7 + 21 + 544 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 8851721544.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3197649 + ... + 3200415.

It is an arithmetic number, because the mean of its divisors is an integer number (252292820).

Almost surely, 2^8851721544 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 8851721544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12110055360).

8851721544 is an abundant number, since it is smaller than the sum of its proper divisors (15368389176).

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

8851721544 is a wasteful number, since it uses less digits than its factorization.

8851721544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3219 (or 3212 counting only the distinct ones).

The product of its digits is 358400, while the sum is 45.

The square root of 8851721544 is about 94083.5880693333. The cubic root of 8851721544 is about 2068.5971142798.

The spelling of 8851721544 in words is "eight billion, eight hundred fifty-one million, seven hundred twenty-one thousand, five hundred forty-four".