8613218209520 has 160 divisors (see below), whose sum is σ = 21022075929600. Its totient is φ = 3275734505472.

The previous prime is 8613218209429. The next prime is 8613218209523. The reversal of 8613218209520 is 259028123168.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8613218209523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 206734451 + ... + 206776109.

It is an arithmetic number, because the mean of its divisors is an integer number (131387974560).

Almost surely, 2^{8613218209520} is an apocalyptic number.

8613218209520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8613218209520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10511037964800).

8613218209520 is an abundant number, since it is smaller than the sum of its proper divisors (12408857720080).

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

8613218209520 is a wasteful number, since it uses less digits than its factorization.

8613218209520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42367 (or 42361 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 47.

The spelling of 8613218209520 in words is "eight trillion, six hundred thirteen billion, two hundred eighteen million, two hundred nine thousand, five hundred twenty".