166171043305 has 8 divisors (see below), whose sum is σ = 199572405192. Its totient is φ = 132825399168.

The previous prime is 166171043293. The next prime is 166171043309. The reversal of 166171043305 is 503340171661.

It can be written as a sum of positive squares in 4 ways, for example, as 213393664 + 165957649641 = 14608^2 + 407379^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 166171043305 - 2⁵ = 166171043273 is a prime.

It is a super-2 number, since 2×166171043305² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166171043309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13922874 + ... + 13934803.

It is an arithmetic number, because the mean of its divisors is an integer number (24946550649).

Almost surely, 2^166171043305 is an apocalyptic number.

It is an amenable number.

166171043305 is a deficient number, since it is larger than the sum of its proper divisors (33401361887).

166171043305 is a wasteful number, since it uses less digits than its factorization.

166171043305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27858875.

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 166171043305 in words is "one hundred sixty-six billion, one hundred seventy-one million, forty-three thousand, three hundred five".