8255516221 has 8 divisors (see below), whose sum is σ = 8416929024. Its totient is φ = 8094312720.

The previous prime is 8255516219. The next prime is 8255516239. The reversal of 8255516221 is 1226155528.

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

It is a cyclic number.

It is not a de Polignac number, because 8255516221 - 2¹ = 8255516219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8255516261) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 28540 + ... + 131626.

It is an arithmetic number, because the mean of its divisors is an integer number (1052116128).

Almost surely, 2^8255516221 is an apocalyptic number.

It is an amenable number.

8255516221 is a deficient number, since it is larger than the sum of its proper divisors (161412803).

8255516221 is a wasteful number, since it uses less digits than its factorization.

8255516221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104651.

The product of its digits is 48000, while the sum is 37.

The square root of 8255516221 is about 90859.8713459358. The cubic root of 8255516221 is about 2021.0702609463.

The spelling of 8255516221 in words is "eight billion, two hundred fifty-five million, five hundred sixteen thousand, two hundred twenty-one".