168961165 has 4 divisors (see below), whose sum is σ = 202753404. Its totient is φ = 135168928.

The previous prime is 168961159. The next prime is 168961211. The reversal of 168961165 is 561169861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 81108036 + 87853129 = 9006^2 + 9373^2 .

It is a cyclic number.

It is not a de Polignac number, because 168961165 - 2³ = 168961157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16896112 + ... + 16896121.

It is an arithmetic number, because the mean of its divisors is an integer number (50688351).

Almost surely, 2^168961165 is an apocalyptic number.

It is an amenable number.

168961165 is a deficient number, since it is larger than the sum of its proper divisors (33792239).

168961165 is an equidigital number, since it uses as much as digits as its factorization.

168961165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33792238.

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

The square root of 168961165 is about 12998.5062603362. The cubic root of 168961165 is about 552.8351290171.

The spelling of 168961165 in words is "one hundred sixty-eight million, nine hundred sixty-one thousand, one hundred sixty-five".