8221286155 has 4 divisors (see below), whose sum is σ = 9865543392. Its totient is φ = 6577028920.

The previous prime is 8221286137. The next prime is 8221286189. The reversal of 8221286155 is 5516821228.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 8221286155 - 2¹¹ = 8221284107 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 822128611 + ... + 822128620.

It is an arithmetic number, because the mean of its divisors is an integer number (2466385848).

Almost surely, 2^8221286155 is an apocalyptic number.

8221286155 is a deficient number, since it is larger than the sum of its proper divisors (1644257237).

8221286155 is a wasteful number, since it uses less digits than its factorization.

8221286155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644257236.

The product of its digits is 76800, while the sum is 40.

The square root of 8221286155 is about 90671.3083340039. The cubic root of 8221286155 is about 2018.2730522431.

The spelling of 8221286155 in words is "eight billion, two hundred twenty-one million, two hundred eighty-six thousand, one hundred fifty-five".