168965161 has 4 divisors (see below), whose sum is σ = 171345024. Its totient is φ = 166585300.

The previous prime is 168965149. The next prime is 168965201. The reversal of 168965161 is 161569861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 168965161 - 2⁷ = 168965033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168965101) 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, 1189825 + ... + 1189966.

It is an arithmetic number, because the mean of its divisors is an integer number (42836256).

Almost surely, 2^168965161 is an apocalyptic number.

It is an amenable number.

168965161 is a deficient number, since it is larger than the sum of its proper divisors (2379863).

168965161 is an equidigital number, since it uses as much as digits as its factorization.

168965161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2379862.

The product of its digits is 77760, while the sum is 43.

The square root of 168965161 is about 12998.6599693968. The cubic root of 168965161 is about 552.8394872410.

The spelling of 168965161 in words is "one hundred sixty-eight million, nine hundred sixty-five thousand, one hundred sixty-one".