165212165 has 8 divisors (see below), whose sum is σ = 203090328. Its totient is φ = 128945920.

The previous prime is 165212161. The next prime is 165212207. The reversal of 165212165 is 561212561.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17322244 + 147889921 = 4162^2 + 12161^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165212165 - 2² = 165212161 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165212161) 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, 402752 + ... + 403161.

It is an arithmetic number, because the mean of its divisors is an integer number (25386291).

Almost surely, 2^165212165 is an apocalyptic number.

It is an amenable number.

165212165 is a deficient number, since it is larger than the sum of its proper divisors (37878163).

165212165 is an equidigital number, since it uses as much as digits as its factorization.

165212165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805959.

The product of its digits is 3600, while the sum is 29.

The square root of 165212165 is about 12853.4884369964. The cubic root of 165212165 is about 548.7156422260.

The spelling of 165212165 in words is "one hundred sixty-five million, two hundred twelve thousand, one hundred sixty-five".