163165405 has 16 divisors (see below), whose sum is σ = 223264944. Its totient is φ = 113402880.

The previous prime is 163165361. The next prime is 163165421. The reversal of 163165405 is 504561361.

It can be written as a sum of positive squares in 8 ways, for example, as 3345241 + 159820164 = 1829^2 + 12642^2 .

It is not a de Polignac number, because 163165405 - 2⁹ = 163164893 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72726 + ... + 74935.

It is an arithmetic number, because the mean of its divisors is an integer number (13954059).

Almost surely, 2^163165405 is an apocalyptic number.

It is an amenable number.

163165405 is a deficient number, since it is larger than the sum of its proper divisors (60099539).

163165405 is a wasteful number, since it uses less digits than its factorization.

163165405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147696.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 163165405 is about 12773.6214520394. The cubic root of 163165405 is about 546.4402664440.

The spelling of 163165405 in words is "one hundred sixty-three million, one hundred sixty-five thousand, four hundred five".