201685166866 has 8 divisors (see below), whose sum is σ = 302594093244. Its totient is φ = 100820469120.

The previous prime is 201685166773. The next prime is 201685166869. The reversal of 201685166866 is 668661586102.

It can be written as a sum of positive squares in 2 ways, for example, as 182743425225 + 18941741641 = 427485^2 + 137629^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (201685166869) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 11045755 + ... + 11063998.

Almost surely, 2^201685166866 is an apocalyptic number.

201685166866 is a deficient number, since it is larger than the sum of its proper divisors (100908926378).

201685166866 is a wasteful number, since it uses less digits than its factorization.

201685166866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22114316.

The product of its (nonzero) digits is 4976640, while the sum is 55.

The spelling of 201685166866 in words is "two hundred one billion, six hundred eighty-five million, one hundred sixty-six thousand, eight hundred sixty-six".