8215218516 has 24 divisors (see below), whose sum is σ = 20296422720. Its totient is φ = 2577323392.

The previous prime is 8215218481. The next prime is 8215218523. The reversal of 8215218516 is 6158125128.

It is a super-3 number, since 3×8215218516³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20135136 + ... + 20135543.

It is an arithmetic number, because the mean of its divisors is an integer number (845684280).

Almost surely, 2^8215218516 is an apocalyptic number.

It is an amenable number.

8215218516 is an abundant number, since it is smaller than the sum of its proper divisors (12081204204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8215218516 is a wasteful number, since it uses less digits than its factorization.

8215218516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40270703 (or 40270701 counting only the distinct ones).

The product of its digits is 38400, while the sum is 39.

The square root of 8215218516 is about 90637.8426265762. The cubic root of 8215218516 is about 2017.7764078817.

The spelling of 8215218516 in words is "eight billion, two hundred fifteen million, two hundred eighteen thousand, five hundred sixteen".