165136161 has 4 divisors (see below), whose sum is σ = 220181552. Its totient is φ = 110090772.

The previous prime is 165136157. The next prime is 165136177. The reversal of 165136161 is 161631561.

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 not a de Polignac number, because 165136161 - 2² = 165136157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165136061) 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, 27522691 + ... + 27522696.

It is an arithmetic number, because the mean of its divisors is an integer number (55045388).

Almost surely, 2^165136161 is an apocalyptic number.

It is an amenable number.

165136161 is a deficient number, since it is larger than the sum of its proper divisors (55045391).

165136161 is an equidigital number, since it uses as much as digits as its factorization.

165136161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55045390.

The product of its digits is 3240, while the sum is 30.

The square root of 165136161 is about 12850.5315454264. The cubic root of 165136161 is about 548.6314858312.

The spelling of 165136161 in words is "one hundred sixty-five million, one hundred thirty-six thousand, one hundred sixty-one".