166681818333 has 64 divisors (see below), whose sum is σ = 257002986240. Its totient is φ = 106678944000.

The previous prime is 166681818313. The next prime is 166681818341. The reversal of 166681818333 is 333818186661.

It is not a de Polignac number, because 166681818333 - 2⁶ = 166681818269 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 166681818333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166681818313) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30973303 + ... + 30978683.

It is an arithmetic number, because the mean of its divisors is an integer number (4015671660).

Almost surely, 2^166681818333 is an apocalyptic number.

It is an amenable number.

166681818333 is a deficient number, since it is larger than the sum of its proper divisors (90321167907).

166681818333 is a wasteful number, since it uses less digits than its factorization.

166681818333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5835 (or 5829 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 54.

The spelling of 166681818333 in words is "one hundred sixty-six billion, six hundred eighty-one million, eight hundred eighteen thousand, three hundred thirty-three".