66566105650 has 24 divisors (see below), whose sum is σ = 135068680944. Its totient is φ = 24205856400.

The previous prime is 66566105647. The next prime is 66566105651. The reversal of 66566105650 is 5650166566.

It is a self number, because there is not a number n which added to its sum of digits gives 66566105650.

It is not an unprimeable number, because it can be changed into a prime (66566105651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60514092 + ... + 60515191.

It is an arithmetic number, because the mean of its divisors is an integer number (5627861706).

Almost surely, 2^66566105650 is an apocalyptic number.

66566105650 is an abundant number, since it is smaller than the sum of its proper divisors (68502575294).

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

66566105650 is a wasteful number, since it uses less digits than its factorization.

66566105650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121029306 (or 121029301 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 46.

The spelling of 66566105650 in words is "sixty-six billion, five hundred sixty-six million, one hundred five thousand, six hundred fifty".