201550166866 has 16 divisors (see below), whose sum is σ = 322838979840. Its totient is φ = 94161367440.

The previous prime is 201550166849. The next prime is 201550166893. The reversal of 201550166866 is 668661055102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56046636 + ... + 56050231.

It is an arithmetic number, because the mean of its divisors is an integer number (20177436240).

Almost surely, 2^201550166866 is an apocalyptic number.

201550166866 is a deficient number, since it is larger than the sum of its proper divisors (121288812974).

201550166866 is a wasteful number, since it uses less digits than its factorization.

201550166866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112096929.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 201550166866 in words is "two hundred one billion, five hundred fifty million, one hundred sixty-six thousand, eight hundred sixty-six".