165644158 has 16 divisors (see below), whose sum is σ = 267398064. Its totient is φ = 76671360.

The previous prime is 165644123. The next prime is 165644159. The reversal of 165644158 is 851446561.

It is a self number, because there is not a number n which added to its sum of digits gives 165644158.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165644159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37860 + ... + 42007.

It is an arithmetic number, because the mean of its divisors is an integer number (16712379).

Almost surely, 2^165644158 is an apocalyptic number.

165644158 is a deficient number, since it is larger than the sum of its proper divisors (101753906).

165644158 is a wasteful number, since it uses less digits than its factorization.

165644158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79947.

The product of its digits is 115200, while the sum is 40.

The square root of 165644158 is about 12870.2819704931. The cubic root of 165644158 is about 549.1934823669.

The spelling of 165644158 in words is "one hundred sixty-five million, six hundred forty-four thousand, one hundred fifty-eight".