168366161 has 4 divisors (see below), whose sum is σ = 171126324. Its totient is φ = 165606000.

The previous prime is 168366157. The next prime is 168366193. The reversal of 168366161 is 161663861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161663861 = 41 ⋅3943021.

It can be written as a sum of positive squares in 2 ways, for example, as 2085136 + 166281025 = 1444^2 + 12895^2 .

It is a cyclic number.

It is not a de Polignac number, because 168366161 - 2² = 168366157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168366151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1379990 + ... + 1380111.

It is an arithmetic number, because the mean of its divisors is an integer number (42781581).

Almost surely, 2^168366161 is an apocalyptic number.

It is an amenable number.

168366161 is a deficient number, since it is larger than the sum of its proper divisors (2760163).

168366161 is an equidigital number, since it uses as much as digits as its factorization.

168366161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2760162.

The product of its digits is 31104, while the sum is 38.

The square root of 168366161 is about 12975.5986759764. The cubic root of 168366161 is about 552.1854215440.

The spelling of 168366161 in words is "one hundred sixty-eight million, three hundred sixty-six thousand, one hundred sixty-one".