8218871525 has 6 divisors (see below), whose sum is σ = 10191400722. Its totient is φ = 6575097200.

The previous prime is 8218871509. The next prime is 8218871579. The reversal of 8218871525 is 5251788128.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 145130209 + 8073741316 = 12047^2 + 89854^2 .

It is not a de Polignac number, because 8218871525 - 2⁴ = 8218871509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8218871525.

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 5 ways as a sum of consecutive naturals, for example, 164377406 + ... + 164377455.

It is an arithmetic number, because the mean of its divisors is an integer number (1698566787).

Almost surely, 2^8218871525 is an apocalyptic number.

It is an amenable number.

8218871525 is a deficient number, since it is larger than the sum of its proper divisors (1972529197).

8218871525 is a wasteful number, since it uses less digits than its factorization.

8218871525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328754871 (or 328754866 counting only the distinct ones).

The product of its digits is 358400, while the sum is 47.

The square root of 8218871525 is about 90657.9920635793. The cubic root of 8218871525 is about 2018.0754408330.

The spelling of 8218871525 in words is "eight billion, two hundred eighteen million, eight hundred seventy-one thousand, five hundred twenty-five".