163540165 has 8 divisors (see below), whose sum is σ = 197566200. Its totient is φ = 129953472.

The previous prime is 163540147. The next prime is 163540171. The reversal of 163540165 is 561045361.

It can be written as a sum of positive squares in 4 ways, for example, as 13771521 + 149768644 = 3711^2 + 12238^2 .

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 163540165 - 2⁵ = 163540133 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 7 ways as a sum of consecutive naturals, for example, 109014 + ... + 110503.

It is an arithmetic number, because the mean of its divisors is an integer number (24695775).

Almost surely, 2^163540165 is an apocalyptic number.

It is an amenable number.

163540165 is a deficient number, since it is larger than the sum of its proper divisors (34026035).

163540165 is a wasteful number, since it uses less digits than its factorization.

163540165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219671.

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

The square root of 163540165 is about 12788.2823318849. The cubic root of 163540165 is about 546.8583031202.

The spelling of 163540165 in words is "one hundred sixty-three million, five hundred forty thousand, one hundred sixty-five".