165500643 has 16 divisors (see below), whose sum is σ = 275118336. Its totient is φ = 85974240.

The previous prime is 165500611. The next prime is 165500669. The reversal of 165500643 is 346005561.

It is not a de Polignac number, because 165500643 - 2⁵ = 165500611 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165500643.

It is not an unprimeable number, because it can be changed into a prime (165500603) by changing a digit.

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, 357996 + ... + 358457.

It is an arithmetic number, because the mean of its divisors is an integer number (17194896).

Almost surely, 2^165500643 is an apocalyptic number.

165500643 is a deficient number, since it is larger than the sum of its proper divisors (109617693).

165500643 is a wasteful number, since it uses less digits than its factorization.

165500643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716474.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 165500643 is about 12864.7053211490. The cubic root of 165500643 is about 549.0348284645.

The spelling of 165500643 in words is "one hundred sixty-five million, five hundred thousand, six hundred forty-three".