66500556136 has 64 divisors (see below), whose sum is σ = 147251191680. Its totient is φ = 27559699200.

The previous prime is 66500556127. The next prime is 66500556163. The reversal of 66500556136 is 63165500566.

It is a junction number, because it is equal to n+sod(n) for n = 66500556092 and 66500556101.

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, 239286 + ... + 436186.

It is an arithmetic number, because the mean of its divisors is an integer number (2300799870).

Almost surely, 2^66500556136 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 66500556136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73625595840).

66500556136 is an abundant number, since it is smaller than the sum of its proper divisors (80750635544).

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

66500556136 is a wasteful number, since it uses less digits than its factorization.

66500556136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197114 (or 197110 counting only the distinct ones).

The product of its (nonzero) digits is 486000, while the sum is 43.

The spelling of 66500556136 in words is "sixty-six billion, five hundred million, five hundred fifty-six thousand, one hundred thirty-six".