6581108736 has 420 divisors, whose sum is σ = 21488598600. Its totient is φ = 2006581248.

The previous prime is 6581108719. The next prime is 6581108741. The reversal of 6581108736 is 6378011856.

It is a junction number, because it is equal to n+sod(n) for n = 6581108691 and 6581108700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 226934770 + ... + 226934798.

It is an arithmetic number, because the mean of its divisors is an integer number (51163330).

Almost surely, 2^6581108736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6581108736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10744299300).

6581108736 is an abundant number, since it is smaller than the sum of its proper divisors (14907489864).

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

6581108736 is an frugal number, since it uses more digits than its factorization.

6581108736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 6581108736 is about 81124.0330358396. The cubic root of 6581108736 is about 1873.9860578702.

The spelling of 6581108736 in words is "six billion, five hundred eighty-one million, one hundred eight thousand, seven hundred thirty-six".