50005665666 has 24 divisors (see below), whose sum is σ = 118195210224. Its totient is φ = 15153231960.

The previous prime is 50005665653. The next prime is 50005665739. The reversal of 50005665666 is 66656650005.

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 11 ways as a sum of consecutive naturals, for example, 126276736 + ... + 126277131.

It is an arithmetic number, because the mean of its divisors is an integer number (4924800426).

Almost surely, 2^50005665666 is an apocalyptic number.

50005665666 is an abundant number, since it is smaller than the sum of its proper divisors (68189544558).

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

50005665666 is a wasteful number, since it uses less digits than its factorization.

50005665666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252553886 (or 252553883 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 45.

The spelling of 50005665666 in words is "fifty billion, five million, six hundred sixty-five thousand, six hundred sixty-six".