6531688660 has 96 divisors (see below), whose sum is σ = 16683625728. Its totient is φ = 2096855040.

The previous prime is 6531688591. The next prime is 6531688661. The reversal of 6531688660 is 668861356.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6531688661) 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, 461895 + ... + 475825.

It is an arithmetic number, because the mean of its divisors is an integer number (173787768).

Almost surely, 2^6531688660 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 6531688660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8341812864).

6531688660 is an abundant number, since it is smaller than the sum of its proper divisors (10151937068).

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

6531688660 is a wasteful number, since it uses less digits than its factorization.

6531688660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14161 (or 14159 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 49.

The square root of 6531688660 is about 80818.8632684227. The cubic root of 6531688660 is about 1869.2834396050.

The spelling of 6531688660 in words is "six billion, five hundred thirty-one million, six hundred eighty-eight thousand, six hundred sixty".