165106405 has 4 divisors (see below), whose sum is σ = 198127692. Its totient is φ = 132085120.

The previous prime is 165106373. The next prime is 165106411. The reversal of 165106405 is 504601561.

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 58232161 + 106874244 = 7631^2 + 10338^2 .

It is not a de Polignac number, because 165106405 - 2⁵ = 165106373 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, 16510636 + ... + 16510645.

It is an arithmetic number, because the mean of its divisors is an integer number (49531923).

Almost surely, 2^165106405 is an apocalyptic number.

It is an amenable number.

165106405 is a deficient number, since it is larger than the sum of its proper divisors (33021287).

165106405 is an equidigital number, since it uses as much as digits as its factorization.

165106405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33021286.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 165106405 is about 12849.3737201468. The cubic root of 165106405 is about 548.5985310884.

Adding to 165106405 its reverse (504601561), we get a palindrome (669707966).

The spelling of 165106405 in words is "one hundred sixty-five million, one hundred six thousand, four hundred five".