8765552221 has 8 divisors (see below), whose sum is σ = 8831911680. Its totient is φ = 8699227488.

The previous prime is 8765552183. The next prime is 8765552227. The reversal of 8765552221 is 1222555678.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8765552221 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8765552227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 736500 + ... + 748306.

It is an arithmetic number, because the mean of its divisors is an integer number (1103988960).

Almost surely, 2^8765552221 is an apocalyptic number.

It is an amenable number.

8765552221 is a deficient number, since it is larger than the sum of its proper divisors (66359459).

8765552221 is a wasteful number, since it uses less digits than its factorization.

8765552221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17363.

The product of its digits is 336000, while the sum is 43.

The square root of 8765552221 is about 93624.5278813196. The cubic root of 8765552221 is about 2061.8627871057.

It can be divided in two parts, 87655 and 52221, that added together give a square (139876 = 374²).

The spelling of 8765552221 in words is "eight billion, seven hundred sixty-five million, five hundred fifty-two thousand, two hundred twenty-one".