56535521666 has 12 divisors (see below), whose sum is σ = 91828407042. Its totient is φ = 26093317536.

The previous prime is 56535521591. The next prime is 56535521677. The reversal of 56535521666 is 66612553565.

It can be written as a sum of positive squares in 3 ways, for example, as 26544555625 + 29990966041 = 162925^2 + 173179^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 83632091 + ... + 83632766.

Almost surely, 2^56535521666 is an apocalyptic number.

56535521666 is a deficient number, since it is larger than the sum of its proper divisors (35292885376).

56535521666 is a wasteful number, since it uses less digits than its factorization.

56535521666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167264885 (or 167264872 counting only the distinct ones).

The product of its digits is 4860000, while the sum is 50.

The spelling of 56535521666 in words is "fifty-six billion, five hundred thirty-five million, five hundred twenty-one thousand, six hundred sixty-six".