165311161 has 8 divisors (see below), whose sum is σ = 166430880. Its totient is φ = 164195328.

The previous prime is 165311141. The next prime is 165311231. The reversal of 165311161 is 161113561.

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 165311161 - 2¹¹ = 165309113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165311141) 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, 174090 + ... + 175036.

It is an arithmetic number, because the mean of its divisors is an integer number (20803860).

Almost surely, 2^165311161 is an apocalyptic number.

It is an amenable number.

165311161 is a deficient number, since it is larger than the sum of its proper divisors (1119719).

165311161 is an equidigital number, since it uses as much as digits as its factorization.

165311161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1943.

The product of its digits is 540, while the sum is 25.

The square root of 165311161 is about 12857.3387993006. The cubic root of 165311161 is about 548.8252181110.

The spelling of 165311161 in words is "one hundred sixty-five million, three hundred eleven thousand, one hundred sixty-one".