8221581855 has 96 divisors (see below), whose sum is σ = 15023923200. Its totient is φ = 4154685696.

The previous prime is 8221581773. The next prime is 8221581899. The reversal of 8221581855 is 5581851228.

It is not a de Polignac number, because 8221581855 - 2¹² = 8221577759 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 8221581855.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 12475516 + ... + 12476174.

It is an arithmetic number, because the mean of its divisors is an integer number (156499200).

Almost surely, 2^8221581855 is an apocalyptic number.

8221581855 is a deficient number, since it is larger than the sum of its proper divisors (6802341345).

8221581855 is a wasteful number, since it uses less digits than its factorization.

8221581855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893 (or 890 counting only the distinct ones).

The product of its digits is 256000, while the sum is 45.

The square root of 8221581855 is about 90672.9389343921. The cubic root of 8221581855 is about 2018.2972494378.

The spelling of 8221581855 in words is "eight billion, two hundred twenty-one million, five hundred eighty-one thousand, eight hundred fifty-five".