166851666697 has 16 divisors (see below), whose sum is σ = 169592113152. Its totient is φ = 164137188240.

The previous prime is 166851666689. The next prime is 166851666701. The reversal of 166851666697 is 796666158661.

It is a cyclic number.

It is not a de Polignac number, because 166851666697 - 2³ = 166851666689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166851663697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8892708 + ... + 8911450.

It is an arithmetic number, because the mean of its divisors is an integer number (10599507072).

Almost surely, 2^166851666697 is an apocalyptic number.

It is an amenable number.

166851666697 is a deficient number, since it is larger than the sum of its proper divisors (2740446455).

166851666697 is a wasteful number, since it uses less digits than its factorization.

166851666697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19428.

The product of its digits is 117573120, while the sum is 67.

The spelling of 166851666697 in words is "one hundred sixty-six billion, eight hundred fifty-one million, six hundred sixty-six thousand, six hundred ninety-seven".