6561152520 has 128 divisors (see below), whose sum is σ = 21241785600. Its totient is φ = 1611684864.

The previous prime is 6561152471. The next prime is 6561152557. The reversal of 6561152520 is 252511656.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 789909 + ... + 798171.

It is an arithmetic number, because the mean of its divisors is an integer number (165951450).

Almost surely, 2^6561152520 is an apocalyptic number.

6561152520 is a gapful number since it is divisible by the number (60) 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 6561152520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10620892800).

6561152520 is an abundant number, since it is smaller than the sum of its proper divisors (14680633080).

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

6561152520 is a wasteful number, since it uses less digits than its factorization.

6561152520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8799 (or 8795 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 6561152520 is about 81000.9414760100. The cubic root of 6561152520 is about 1872.0899470076.

The spelling of 6561152520 in words is "six billion, five hundred sixty-one million, one hundred fifty-two thousand, five hundred twenty".