6531661356 has 48 divisors (see below), whose sum is σ = 17075412480. Its totient is φ = 1925795520.

The previous prime is 6531661313. The next prime is 6531661363.

6531661356 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 663796 + ... + 673563.

It is an arithmetic number, because the mean of its divisors is an integer number (355737760).

Almost surely, 2^6531661356 is an apocalyptic number.

6531661356 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

6531661356 is an abundant number, since it is smaller than the sum of its proper divisors (10543751124).

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

6531661356 is a wasteful number, since it uses less digits than its factorization.

6531661356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337414 (or 1337412 counting only the distinct ones).

The product of its digits is 291600, while the sum is 42.

The square root of 6531661356 is about 80818.6943472858. The cubic root of 6531661356 is about 1869.2808349194.

The spelling of 6531661356 in words is "six billion, five hundred thirty-one million, six hundred sixty-one thousand, three hundred fifty-six".