166666666765 has 16 divisors (see below), whose sum is σ = 200202928128. Its totient is φ = 133198131456.

The previous prime is 166666666729. The next prime is 166666666783. The reversal of 166666666765 is 567666666661.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166666666765 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166666666765.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33552312 + ... + 33557278.

It is an arithmetic number, because the mean of its divisors is an integer number (12512683008).

Almost surely, 2^166666666765 is an apocalyptic number.

It is an amenable number.

166666666765 is a deficient number, since it is larger than the sum of its proper divisors (33536261363).

166666666765 is a wasteful number, since it uses less digits than its factorization.

166666666765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10428.

The product of its digits is 352719360, while the sum is 67.

The spelling of 166666666765 in words is "one hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, seven hundred sixty-five".